How do you find the mass of a photon?
Expert Answer:
- λ = 589 nm = 5.89 x 10-7 m.
- c = 3.0 X 10 8 m/s.
- We know , from de Broglie relation ; λ = h/mv(c for photon)
- Hence, Mass of photon = h/c λ
What is the mass of photon and electron?
The mass of a photon electron is 9. 1×10−31 kg.
Why is rest mass of photon is zero?
But according to special relativity, light ALWAYS travels with the light speed c, and is NEVER at rest. And so it has zero REST mass. which means that though photons don’t have rest mass, they do have energy and thus they have mass.
What is the mass of a photon in motion?
A photon has energy E = hf where h is Planck’s constant and f is the frequency of the photon. ⇒ m = hx/c2 is the mass of a photon in motion. Was this answer helpful?
What is the rest mass of proton?
proton, stable subatomic particle that has a positive charge equal in magnitude to a unit of electron charge and a rest mass of 1.67262 × 10−27 kg, which is 1,836 times the mass of an electron.
Do photons have weight?
Light is composed of photons, so we could ask if the photon has mass. The answer is then definitely “no”: the photon is a massless particle. According to theory it has energy and momentum but no mass, and this is confirmed by experiment to within strict limits.
What is mass of light?
Light has no mass so it also has no energy according to Einstein, but how can sunlight warm the earth without energy? Light indeed carries energy via its momentum despite having no mass.
What is the mass of 1 proton in amu?
1.007277 amu
mp = mass of a proton (1.007277 amu) mn = mass of a neutron (1.008665 amu)
What is the mass of 1 electron?
electron, lightest stable subatomic particle known. It carries a negative charge of 1.602176634 × 10−19 coulomb, which is considered the basic unit of electric charge. The rest mass of the electron is 9.1093837015 × 10−31 kg, which is only 1/1,836the mass of a proton.
How can photon have no mass?
Why do photons have no mass? In short, the special theory of relativity predicts that photons do not have mass simply because they travel at the speed of light. This is also backed up by the theory of quantum electrodynamics, which predicts that photons cannot have mass as a result of U(1) -gauge symmetry.
Does photon have weight?
At the same time, a photon cannot have mass and, therefore, weighs nothing. The theory of relativity tells us that the mass of an object is proportional to the square of its velocity. Moreover, as the velocity approaches that of the speed of light, its mass approaches infinity.
How photon has no mass?
What is the mass of one proton?
What is the mass of one neutron?
Neutrons
| Particle | Symbol | Mass (amu) |
|---|---|---|
| proton | p+ | 1 |
| electron | e− | 5.45 × 10−4 |
| neutron | n0 | 1 |
Do photons bend space-time?
Yes, photons bend spacetime.
Is mass of photon really zero?
What do if photons actually have mass?
Photons aren’t masses. They don’t have mass. They do have energy, just like matter, but not mass. At least, not “rest” mass, the kind of mass you have when you stop moving, since photons never stop moving. 2. Photons aren’t matter. They’re not matter because one of the properties of matter is that it takes up space.
How much mass is equivalent to one photon?
The mass equivalent of a photon of frequency One Hertz is 7.375×10^ (-31) kg. Note that this is not the mass of a photon. If one succeeds in transforming energy of a photon into a matter ( mass) this amount of mass can be recovered. And energy of photon depends on frequency. Pet wellness plans that start immediately.
How can a photon have a relative mass?
photons have mass beacuse of einstien statement and by influence of gravity on photons we can say that photons have mass It is wrong beacuse light carry photons which have energy and momentum with this we can say light carry energy with it.
Do all photons have the same mass?
So, no, all photons are not the same. Yes, all photons have zero rest mass and all travel with 300000 km /s in vacuum. A photon is really only distinquished by its energy (frequency) and spin projection or polarization. All photons of a particular energy and spin projection are indistinguishable. In about the same way all electrons are the same.