why photon has momentum but not mass
Answers
Answer:
There is a fundamental difference between a photon and other material particles. The word ‘particle’ means that it has a measurable rest mass. It could even have a rest mass nearly equal to zero. It has been clearly established that the photons, if at all at rest, would have zero mass and hence, zero momentum. However, photons can never be arrested. This would mean that photons do possess definite momentum by virtue of their motion. They always keep moving with a velocity equal to that of light. Quantum physicists have tried to visualize light as photons because such a notion simply helped them appreciate the phenomena discovered at the end of nineteenth century such as Compton effect, photoelectric effect, etc. Because a photon has a definite energy and definite momentum, which are typically the properties of any particle, photon is considered to represent the particle nature of any electromagnetic radiation. Nonetheless, the claim that a particle moving at the speed of light reaches infinite mass (an impossible feat indeed for a material particle as it can never pick up a speed equalling the speed of light) simply does not apply to photons as , at the first instant, they do not have rest mass at all. The rules of relativity apply to particles or objects (with a definite rest mass) travelling at a speed comparable to that of light (photons).
Explanation:
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Answer:
Since photons (particles of light) have no mass, they must obey E = pc and therefore get all of their energy from their momentum. ... If a particle has no mass (m = 0) and is at rest (p = 0), then the total energy is zero (E = 0).