Question

what is the mass of a photon?​

Answer 1

Answer:

the photon rest mass is zero

Answer 2

$\huge{\mathcal\red{♡Answer:}}$

$\bold\blue{\boxed{The\:photon's\:rest\:mass\:is\:zero.}}$

$\huge{\mathcal\red{♡Explaination :}}$

★ The concept of the rest mass derives from special relativity. The rest mass is the mass of a particle (in our case the photon) as measured by an observer who sees the particle still and with zero speed.

★ It is because 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.

★ If you take Einstein's equation E = m c^2 , where m = mass and c = speed of light, and the Planck equation for the energy of a photon, E = h f , where h = Planck's constant and f = the frequency of the photon, and combine them you get: m c^2 = hf or that m = h f/c^2.

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