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Well, the energy of each photon is (Planck's Konstant 'h') times (frequency 'f'),
and it's also [ KE = 1/2 m V2 ].
But V = speed of light = c .
Set the two expressions for energy equal.
h f = 1/2 m c2
Multiply each side by 2:
2 h f = m c2
Divide each side by c2, and you have the mass of one photon:
m = 2 h f / c2
This bothers us, because of you go two equations back, you have, as we said,
2 h f = m c2 .
The [ 2 h f ] on the left side is double the energy of the photon. But if there's one
thing that everybody knows about Relativity, it's the fact that [mc2=E], not 2E.
This is a problem about which we don't really feel like worrying right now.
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What type of mass is light?
Light does not have mass. It consists of electromagnetic waves that do not possess rest mass.
What has no mass?
Light has no mass. It is composed of photons, which are particles that do not have any mass.
Does light from a flashlight have mass?
No, light does not have mass. Light is composed of particles called photons, which have no rest mass, but they do have momentum and energy.
Who discovered that light has mass?
Light does not have mass. It was through experiments and theories in physics that it was established that light, being composed of massless particles called photons, does not have mass.
Does light have mass?
No, light does not have mass. It is made up of particles called photons, which are massless.
