Does Light quanta has a rest mass?

Question

The Soviet/Russian academic S. Vavilov suggested an
interesting idea. In his book 'Isaac Newton' he wrote.
The force, according to the Newton,s Second Law,
is equal to : F= ma.
This force is possible to consider as absolute independent
quantity - impulse. When in case with light quanta
the impulse is equal to: mc.
He continued.
Let us now imagine that light quanta falls on a black body,
and it absolutely absorbs this light quanta
( it means light quanta stops).
Then, according to the Lebedev,s law, light quanta
renders pressure on the black body: E/c.
Therefore it is possible to write: mc=E/c.
It means that according to Classic physics the stopping
light quanta has rest mass: M=E/c^2. (E=Mc^2).
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What is your opinion?

Answer 1

Vavilov is both right and wrong. The photon does *NOT* have rest mass; but it does have momentum, so that when it hits a blackbody work is actually done. The same is true for reflection. In fact, the whole concept of the "light sail" depends on the fact that photons have momentum.

HTH

Charles

Answer 2

One of the parameters for the existence of light quanta is the speed of light.
When a light quanta comes into existence it has no velocity,so it must accelerate to "C"
The principle that limits the speed of light also limits it:s acceleration rate.
When the emitter is turned on the beam travels in the direction of emission and accelerates from zero to "C" in a distance of 1cm in one thirty-billionths of a second.

Answer 3

i think of something mass of sunshine can in basic terms be seen in the context of skill capability. in any different case Time might might desire to be handed over simply by fact concept means that it takes an endless volume of capability to develop up mass to c^^2. considering the fact that mass and capability are distinctive varieties of the comparable element, at c^^2 a gentle quanta might have endless mass. in basic terms some techniques.

Answer 4

Photons have zero rest mass. In fact, I don't think it is even possible for a photon to exist at rest. It is emitted by a particle and moves at c until it is absorbed by another particle. If it never gets absorbed by a particle, it just keeps moving at c, for billions of years sometimes.

Answer 5

The photon has no rest mass... Here's a good explanation

http://math.ucr.edu/home/baez/physics/Relativity/SR/light_mass.html