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# How can photons have energy without mass

Since photons have zero rest mass then their energy is simply E = pc. The fact that light carries momentum is also verified by experiment. The other issue you raise, the fact that the apparent velocity of light is less in a dielectric medium, has to do with the interaction of light within the medium What you are referring to must be this most famous equation: When a particle has zero mass, its energy must be zero because E = 0 * c^2 = 0. So you are already concluding it right. A photon ( light particle) that has its mass zero, could not have energy. As many has answered, that E = mc^2 is not a complete formula

### Q & A: How can photons have energy if they have no mass

1. The theory of Special Relativity, proved in 1905 (or rather the 2nd paper of that year on the subject) gives an equation for the relativistic energy of a particle; E 2 = ( m 0 c 2) 2 + p 2 c 2. where m 0 is the rest mass of the particle (0 in the case of a photon)
2. Since photons (particles of light) have no mass, they must obey E= pcand therefore get all of their energy from their momentum. Now there is an interesting additional effect contained in the general equation. If a particle has no mass (m= 0) andis at rest (p= 0), then the total energy is zero (E= 0)
3. Indeed, photons have no mass. However, they DO have energy and momentum. It turns out that energy and momentum are the requirements that make a solar sail work, not mass. If we think about a slow massive particle, like a bowling ball, we can help to make sense of this
4. Photons don't have any 'rest mass,' all of their energy is associated with their frequency in motion, like a wave on the sea: the wave doesn't exist if it isn't moving - so it can possess energy (and an equivalent mass) as it moves, but it has no 'rest mass.'

Originally Answered: How do photons have momentum without mass? A first mission is to find an expression for kinetic energy in the field of relativity given by (1) Ec = ƒ Fdr = ƒ [ d (mv) / dt] dr = ƒ v d (mv) where the integral ƒ is extended between 0 and During a molecular, atomic or nuclear transition to a lower energy level, photons of various energy will be emitted, ranging from radio waves to gamma rays. Photons can also be emitted when a particle and its corresponding antiparticle are annihilated (for example, electron-positron annihilation). Relativistic energy and momentu This is something that I have always been puzzled over. A current running theory is that when the universe was born, there was so much energy coming out of this one point, that some of it got converted into mass. However, I don't see how energy, in any form, can exist without mass. Yes.. Astronomy: Roen Kelly While it is true that photons have no mass, it is also true that we see light bend around sources with high mass due to gravity. This is not because the mass pulls on the.. If Photons Have Zero Mass, How Can Black Holes Pull Them In? [Video] New York University research scientist Gabe Perez-Giz answers viewer questions submitted to our YouTube Spacelab Channel

### How can photons have no mass and yet still have energy

1. If we let E be the energy of a photon (or a billion, gazillion photons), and m be the mass of that/those photons (i.e. zero), then E=0 x c2, or E=0. So if photons have no mass, it would seem they can have no energy either, which is patently incorrect
2. Photons themselves have no mass of their own, but they have energy when they move, which Einstein said could be the same thing. Does gravity affect things without mass? Gravity impacts almost everything that carries energy, even a particle without any mass. This is why the gravitational energy of dark matter can change the path of light in space
3. Photons are tiny packets, or quanta, of light, and have energy in the form of electromagnetism. They do not have mass, but they do have momentum - a property in physics which is usually attributed to an object's mass
4. If photons have zero mass, How can a massless photon go into black hole and not escape from it? Notice that nowhere so far have I mentioned mass, this rule applies for all matter and energy, whether they have mass or not! It turns out that very close to the black hole,.
5. In particle physics, a massless particle is an elementary particle whose invariant mass is zero. The two known massless particles are both gauge bosons: the photon and the gluon. However, gluons are never observed as free particles, since they are confined within hadrons. Neutrinos were originally thought to be massless. However, because neutrinos change flavor as they travel, at least two of the types of neutrinos must have mass. The discovery of this phenomenon, known as.
6. Does the photon have mass? After all, it has energy and energy is equivalent to mass. Photons are traditionally said to be massless. This is a figure of speech that physicists use to describe something about how a photon's particle-like properties are described by the language of special relativity. The logic can be constructed in many ways, and the following is one such

### special relativity - If photons have no mass, how can they

• E=mc^2 which means energy and mass are related, so how can light have energy when it doesn't have mass? The notion of mass changed after works from Lorentz,.
• Photons and gluons, two force-carrying particles, are fundamental, so they don't host the internal tug-of-war of a composite particle. They are also unaffected by the Higgs field. Indeed, they seem to be without mass. Massless particles are purely energy
• A massless particle can have energy E and momentum p because mass is related to these by the equation m 2 = E 2 /c 4 - p 2 /c 2, which is zero for a photon because E = pc for massless radiation. The energy and momentum of light also generates curvature of spacetime, so general relativity predicts that light will attract objects gravitationally
• Photons have no charge, no resting mass, and travel at the speed of light. Photons are emitted by the action of charged particles, although they can be emitted by other methods including radioactive decay. Since they are extremely small particles, the contribution of wavelike characteristics to the behavior of photons is significant
• g light, since it just changes directions and thus changes the sign of its momentum

Given the fact that E=mc2 and photons carry energy someone would suppose that photons actually have mass. But is this true?What about momentum? Do photons ha.. Q: How can photons have energy and momentum, but no mass? Q: If you were on the inside of the Sun falling in, the matter closer to the surface doesn't affect your acceleration, but the matter closer to the core does If you now introduce 'invariant mass' as a parameter, then you have introduced the possibility for virtual photons to have a infinite mass too. I'm rather sure you also will have to change a lot of other mathematics and definitions if photons would be found to be of a mass, even though not all Thus, these photons are short-lived packets of transverse wave energy. A photon does not have mass like a particle. Mass is defined in energy wave theory as stored energy from standing waves without consideration of wave speed. A photon is a traveling wave without any wave centers

### Light has no mass so it also has no energy according to

• If you can imagine trapping a particle moving at light speed in a quantum sized quark or electron as charge or spin, you can understand why all that motion/energy trapped in a very tiny space would add mass (potential energy) to the particle, and sure enough, Einstein's mass-energy equivalence equation ( E=mc 2) backs up this logic
• Photons, the elementary particles that make up light, are known to be fast, weightless and to not interact with each other. But in new experiments, physicists at MIT and Harvard have now created a.
• Photons do not have a mass of any sort, and mass is not needed to interact with other objects. Momentum and energy are the only important quantities here. I fear that people would think they can thus compute simple interactions, like elastic shocks, using classical formulaes when dealing with photons

The first point to make is that while photons (little packets of light energy) do not have mass, they do have momentum, and a change in momentum yields a force, so in actual fact light is able to physically interact with matter

How can a photon have momentum and yet not have a mass? Einstein's great insight was that the energy of a photon must be equivalent to a quantity of mass and hence could be related to the momentum Photons have zero energy at rest because they're sort of a special case, so it seems weird that they can have zero mass but positive energy. However, consider that most of the mass of your body is just energy, not even rest-mass of elementary particles Yes it does. Although the photon has zero rest mass, it does have energy. From the relativistic relationships among Energy, Mass, and Momentum, E 2 = (M o c 2) 2 + (pc) 2, if the rest mass is zero then the momentum is give by p = E/c. Consider a photon bouncing directly back from a small mirror.It is observed by direct experimental measurement that if a laser beam is reflected from a mirror. This is a wonderful question In the first instance, it's answered by Einstein's theory of general relativity. (Spoiler alert, light travels along geodesics, which are approximately straight lines in most circumstances that humans encounter in everyday life, but are curved by gravity) Photons can produce shock waves in water or air, X-rays and gamma rays. Wavelength is also a stand-in for energy: The long wavelengths of radio light have low energy, and the short-wavelength gamma rays have the highest energy, An electron and a positron have the same mass,.

Since photons can't think, we don't have to worry too much about their no part may be reproduced without the written permission. The content is Mass is energy. Nov 21, 2011. A. Imperial College London physicists have discovered how to create matter from light - a feat thought impossible when the idea was first theorised 80 years ago Energy can be converted from one form into another, even from rest mass energy into purely kinetic energy, but it always exists in the form of particles. Image credit: Andrew Deniszczyc, 2017 It may appear that because photons have zero rest mass (m 0 =0), their mass is zero too. A closer look at the equation will show that this is not the case because photons travel with the velocity c and the equation collapses to an undefined form (m=0/0) The conclusion is that this equation applies only to sub-lightspeed particles and NOT to photons You have to emit a photon to get there; you cannot make that transition without conserving energy, and that energy needs to be carried by a particle -- even a massless one -- in order to make that.

### How are solar sails possible? If photons have no mass, how

Photons with higher energy can take away electrons from atom nuclei. The idea was so powerful that it won Einstein a Noble Prize in physics. So far, light seems to be both wave and particle, which sounds impossible Smashing photons together or getting them really close to one another at high speed throws off interesting bits of mass/energy since they are not really different things. Having photons 'merge' into some interesting mass/energy bit due to what we can call a collision was concurrent with getting the protons up to near light speed and collision type proximity of one another Gamma rays, a form of nuclear and cosmic EM radiation, can have the highest frequencies and, hence, the highest photon energies in the EM spectrum.For example, a γ-ray photon with f = 10 21 Hz has an energy E = hf = 6.63 × 10 −13 J = 4.14 MeV. This is sufficient energy to ionize thousands of atoms and molecules, since only 10 to 1000 eV are needed per ionization The photon can carry energy and momentum from place to place, and it is deflected by the gravitational effects oflarge masses, but in the usual formulations of modern physics it is assigned a rest mass of zero. nite mass as its energy increases without limit;.

### Can energy exist without mass? Physics Forum

• e how the object behaves
• photons have no rest mass yet they have kinetic energy, actually all of it's energy is kinetic. Log in to post comments By Sinisa Lazarek (not verified) on 07 Jul 2012 #permalin
• Rest mass energy of photon E = h ν p and E = m 0 c 2 then the frequency becomes (1) ν p = m 0 c 2 h and momentum of photon p = m 0 c p, and hence according to de Broglie hypothesis its wavelength becomes (2) λ p = h m 0 c p and wave-like velocity (phase velocity) of photon according to the frequency wavelength relation is given by (3) c w = ν p λ
• Mass energy absorption coeffi cients apply to single photon energies but bremsstrahlung photons have a range of energies. A conservative assumption is that they all have an Xo is the exposure rate without the shield (e.g., R/hr) x is the thickness of the shield (e.g., cm
• ating space-time or matter is an abstract achievement of human.

This phenomenon is a wonderful illustration of the fact that mass is not conserved, since the mass of the electron and positron can be created from the energy of the massless photon. Of course, the photon must have sufficient energy to create the rest masses of the two new particles Definition. A photon is the smallest discrete amount or quantum of electromagnetic radiation. It is the basic unit of all light. Photons are always in motion and, in a vacuum, travel at a constant. Photons have been captured from telescopes that have traveled billions of lights years across space and time, yet they retain there speed only slightly influenced by gravitational fields of fields of mass, and they retain the information of there source of origin, and can attain constant updates to this information as it interacts upon various fields of mass, sometimes exchanging its energy. Estimate the binding energy of electrons in magnesium, given that the wavelength of 337 nm is the longest wavelength that a photon may have to eject a photoelectron from magnesium photoelectrode. 66. The work function for potassium is 2.26 eV In order for the photon to continue moving in this electromagnetic field it must have a mass. Only physical particles can hold an electric and magnetic field. More about photons having mass on my other article here

### Why do photons have momentum but no mass? - Quor

1. • Photons are electromagnetic radiation with zero mass, zero charge, and a velocity that is always c, the speed of light. • Because they are electrically neutral, they do not steadily lose energy vi
2. Physicists have found that particles of light, or photons, may live for at least 1 quintillion years, and if they can die, photons may give off very light particles that could travel faster than.
3. e the energy of a photon. If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked
4. Researchers at MIT and elsewhere have found a way to significantly boost the energy that can be harnessed from sunlight, a finding that could lead to better solar cells or light detectors

### Photon - Wikipedi

Matt Strassler [March 27, 2012] A number of puzzling features of the world --- including a number that my readers have asked about in comments --- have everything to do with the nature of mass and energy (and also momentum.) We've all heard these words and many of us have a vague idea of wha Photons. Energy and/or mass being ejected from a nucleus. The maximum energy of a photoelectron cannot be any greater than the energy of the incident photon minus the energy necessary to escape from the surface To put it simply photons are the fundamental particle of light. They have a unique property in that they are both a particle and a wave. This is what allows photons unique properties like. have energies between 4 - 7 MeV (>7.5 MeV and the beta energy, the fraction of beta energy that is converted to photons can be approximated by the following relationship: f = 3.5 x 10-4 Z E max. ¾The mass energy-absorption coefficient is typicall

10 photons have an energy equal to ten times that of a single photon. LONGEST WAVELENGTHS (LEAST ENERGETIC PHOTONS) Gamma Rays X Rays Ultraviolet Radiation FALSE (A) Because a photon has a zero mass, it does not exert a force on the mirror. FALSE (B) Although the photon has energy, it canno How to calculate the energy of a photon. The Planck's equation is. E = h * c / λ = h * f,. where. E is the energy of a photon; h is the Planck constant,; c is the speed of light,; λ is the wavelength of a photon,; f is the frequency of a photon.; This equation gives us an energy of a single, indivisible, quanta of light and we can think of light as a collection of particles The Higgs particle gives everything else in the universe mass, by mediating interactions with a syrupy substance called the Higgs field. Here's what that means

• For photons, he noted, each quantum has an energy and a momentum, which are related to Planck's constant, the speed of light, and the frequency and wavelength of each photon
• Mass is the charge of the gravitational interaction and without it no gravitational force exists. Physicists refer to this manifestation of mass as gravitational mass. When you open a door, you have to push it with a force, otherwise the door won't move
• A photon with a mass equivalence of 2.77 x 10-37 kg, or an energy of 2.5 x 10-20 J, which is a frequency of 3.77 x 10 13 /s, which is an infrared photon. An infrared photon has a mass equivalence that is 1.66 x 10 -10 smaller than the proton mass
• So, I have explained the motion of the photon in a simple manner, providing us with not only a spin but a rate of spin. I have developed actual numbers, first for the radius and mass of the photon, and now for the rate of spin and the tangential velocity and orbital velocity.I have shown how this spin rate creates the visible or measurable wavelength of light
• This can be interpreted so that the light beam consists of small bunches of energy, called photons or light quanta (German 'Lichtquanten' = portions of light). The photon energy is h ν = h c / λ , i.e. the product of Planck's constant h and the optical frequency ν , and is also related to the vacuum wavelength λ
• But on a quantum-mechanical scale, especially for high-energy photons interacting with small masses, photon momentum is significant. Even on a large scale, photon momentum can have an effect if there are enough of them and if there is nothing to prevent the slow recoil of matter
• The photon collides with a relativistic electron at rest, which means that immediately before the collision, the electron's energy is entirely its rest mass energy, Immediately after the collision, the electron has energy E and momentum both of which satisfy

### How does gravity affect photons (that is, bend light) if

1. You can convert mass into energy and energy into mass. As a matter of fact, that's what the sun does every day, it converts some of its mass into energy, which we see as light. And so there is a perfectly reasonable way to talk about the mass of a particle of light
2. The definition of a photon is a particle that has energy and movement; but, Photons are destroyed when radiation is emitted and have zero mass and no energy when at rest. momentum of each photon can be changed in direction without any change of speed
3. Without a rest mass, it can't be increased like other relativistic masses, and this is why light is capable of traveling so quickly. This produces a consistent set of physical laws that agree with experiments, so photons have no relativistic mass and no inertial mass
4. Yes, photons DO have momentum, even though they have no mass! As you will learn in a modern physics course, the energy of a photon is related to its wavelength and frequency via Planck's constant h = 6.626 x 10^(-34) kg*m 2 /s

Photons have no mass. In some cases, electrons can absorb extremely high energy particles of ultraviolet light then emit the energy as longer wavelength photons of observable light, which is a happening called fluorescence All its energy is imparted to the electron, which instantly jumps to a new energy level. The photon itself ceases to be. In the equations which govern this interaction, one side of the equation (for the initial state) has terms for both the electron and the photon, while the other side (representing the final state) has only one term: for the electron The key feature of Einstein's hypothesis was the assumption that radiant energy arrives at the metal surface in particles that we now call photons (a quantum of radiant energy, each of which possesses a particular energy energy $$E$$ given by Equation $$\ref{6.2.1}$$ Einstein postulated that each metal has a particular electrostatic attraction for its electrons that must be overcome before.

It carries energy but has no mass. Waves • A wave is a pattern of motion that can carry energy without carrying matter along with it. atoms can absorb photons with those same energies, upward transitions produce a pattern of absorption lines at the same wavelengths A photon is a particle of light defined as a discrete bundle (or quantum) of electromagnetic (or light) energy.Photons are always in motion and, in a vacuum (a completely empty space), have a constant speed of light to all observers. Photons travel at the vacuum speed of light (more commonly just called the speed of light) of c = 2.998 x 10 8 m/s The smallest unit of light is considered to be a photon, which does not have mass. Also, results of experiments by other researchers during the period between Newton and Einstein showed light having wave-like properties, which made them conclude that light was energy, instead of matter A photon actually has no mass, he says. If it had mass, it couldn't travel at the speed of light. For the most part it is fair to say that light travels at 300,000km/

### If Photons Have Zero Mass, How Can Black Holes Pull Them

Homework Assignment 7 | Solutions Q9.1 The total energy of blackbody photons in an eye of volume V eye is given by E bb = V eyeu= V eyeaT 4 where the second equality comes from the expression u= aT4 for the energy density of blackbody radiation The energy of photon can be sub-divided into two portions; they are the kinetic and the potential energy of photon. When the photon is traveling at the speed of light where the M&E vectors of photon are perpendicular, the photon possesses full kinetic energy

### How can light have energy if it has no mass? Naked

1. Electrons can gain energy by interacting with photons. If a photon has an energy at least as big as the work function, the photon energy can be transferred to the electron and the electron will have enough energy to escape from the metal
2. Since higher energy photons have shorter wavelengths, a change of say 0.024 Å represents a larger energy change than it would for a lower energy photon. All photons scattered at an angle of 90 degrees will undergo a wavelength change of 0.0243Å The change in energy associated with 90-degree scatter is not the same for all photons and depends on their original energy
3. it has energy h ν, linear momentum Even so, experimental efforts to improve the limits on the rest mass of the photon have arisen to challenge contemporary accepted theories, and this has been happening since the time of Cavendish, if not earlier, and in any case well before the modern concept of the photon wa
4. If photons have mass then magnetic fields at large distances will behave differently than if photons don't have mass. The experiements did not see any of the effects that photons with mass would have, so the scientists involved were able to put a limit on how much mass a photon could have based on how good the instrument was
5. While a photon mass breaks gauge invariance and seems unappealing from a theoretical perspective, in the end it's an experimental question whether photons have a mass. And while the mass of the photon is tightly constrained by experiment, to below about 10 -18 eV, the mere possibility that it may be non-zero brings up another very basic question
6. Electromagnetic radiation can be described in terms of a stream of mass-less particles, called photons, X-ray photons have energies in the range 100 eV to 100,000 eV (or 100 keV). Gamma-rays then are all the photons with energies greater than 100 keV. Show me a chart of the wavelength, frequency, and energy regimes of the spectrum

Energy, Power, and Photons Energy in a light wave Why we can often neglect the magnetic field Poynting vector and irradiance The quantum nature of light Photon energy and Photons have no mass and always travel at the speed of light, so we can't use p= mV to determine their momentum How to calculate the energy of a photon. The Planck's equation is. E = h * c / λ = h * f,. where. E is the energy of a photon; h is the Planck constant,; c is the speed of light,; λ is the wavelength of a photon,; f is the frequency of a photon.; This equation gives us an energy of a single, indivisible, quanta of light and we can think of light as a collection of particles

### How much does light weigh? HowStuffWork

Although photons have no mass, they do have momentum, given by: Convincing evidence for the fact that photons have momentum can be seen when a photon collides with a stationary electron. Some of the energy and momentum is transferred to the electron (this is known as the Compton effect), but both energy and momentum are conserved in such a collision Photons have no mass so can swap between 0 and 1 quickly. Electrons have mass and are slow in comparison Glass has much less resistance to light than copper does to electrical signals, so can go much further without needing a boos How can an electron in an atom lose energy to go from a higher energy level to a lower energy level? It releases a photon equal in energy to its own energy drop. Compare lead at 500 K with gold that is 400 K Photoelectric effect : a photon is absoberd, an electron expelled from an atom. The photoelectric effect is the most common form of interaction when the energy of the gamma rays is of the same order of magnitude as the energy binding atomic electrons to the nucleus. The gamma ray can then eject an electron away from an atom, sharing its energy between the electron and the excited atom

### Do photons have mass? - How It Work

Energy is transported by three mechanisms. Radiation - photons carry energy away from the star's center; Convection - cells of hot gas move up, cells of cool gas move down; Conduction - collisions between electrons can move energy outwards; In most stars, conduction is not important. So we have a situation where a lots of energy is being created in the middle of a star The frequency of photon can decide the energy of that photon. As long as the frequency of that photon is higher than threshold frequency, one electron that absorbs that photon will have enough energy to overcome the attraction by other electrons, and then that electron can be emitted Photons can exchange energy with each other through collisions only very weakly; in the presence of ions, the exchange may be much more rapid. As with the particles described in Lec. 13, the photons in a gas have a distribution o PHOTON MASS ENERGY-ABSORPTION COEFFICIENTS 149 METHODS OF CALCULATION Mass Attenuation Coefficient ment is achieved without the renormalization, the current cross-section database is based on the un-renormalized Sco-field values. Scofield's results cover photon energies up t Photon, also called light quantum, minute energy packet of electromagnetic radiation.The concept originated (1905) in Albert Einstein's explanation of the photoelectric effect, in which he proposed the existence of discrete energy packets during the transmission of light.Earlier (1900), the German physicist Max Planck had prepared the way for the concept by explaining that heat radiation is.

### If photons have zero mass, why do they feel the effects of

When it comes to electrons, Higgs bosons or photons, they don't have much going for them. They possess spin, charge, mass and that's about it Mastering Physics Solutions Chapter 30 Quantum Physics Mastering Physics Solutions Chapter 30 Quantum Physics Q.1CQ Give a brief description of the ultraviolet catastrophe. Solution: Chapter 30 Quantum Physics Q.1P CE Predict/Explain The blackbody spectrum of blackbody A peaks at a longer wavelength than that of blackbody B. (a) Is the temperature of blackbody A higher [ When two protons collide in the Large Hadron Collider, they may break apart into subatomic particles called quarks and a mitigating particle force called a gluon.Even when matter and antimatter annihilate each other, they produce energy, in the form of photons, which are quantum units of light.. If you were to build a molecule out of atoms, you wouldn't be creating matter

### Massless particle - Wikipedi

And we can count the photons because we know how much energy goes into each one (it's pretty much the definition), and we can easily add up all the energies for the sources of light Photon Energy. Photon Momentum. This is the currently joke yeah okay totally does light hold mass I don't know does it no it's not even Catholic but weight doesn't really have mass everyone just calm the heck down you see the worst part of all this wasn't that my joke bombed it was that I actually managed to confuse people by telling.      While photons are spawned by movement in electrons, gravitons are whelped by energy and mass. Gravitons are massless, but they do carry energy. This means a graviton can create more gravitons So, by Einstein's E=MC^2, the energy required for a photon to move is greatly reduced, but photons do have mass and are affected by gravity. If photons had no mass at all, then gravity would. Conservation laws are one of the most important aspects of nature. As such, they have been intensively studied and extensively applied, and are considered to be perfectly well established. We, however, raise fundamental question about the very meaning of conservation laws in quantum mechanics. We argue that, although the standard way in which conservation laws are defined in quantum mechanics. X-rays, also known as X-radiation, refers to electromagnetic radiation (no rest mass, no charge) of high energies.X-rays are high-energy photons with short wavelengths and thus very high frequency. The radiation frequency is key parameter of all photons, because it determines the energy of a photon. Photons are categorized according to the energies from low-energy radio waves and infrared.

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