Photon is a type of elementary particle which has a zero rest mass and moves with a speed of light in the vacuum. Einstein explained the momentum (p) of a photon with the given formula. The energy and momentum of a photon are related by the equation
E = pc.
E = energy of the photon
p = momentum of the photon
c = speed of light
The momentum of Photon in terms of wavelength is given by the following derivation
p = mc——–(1)
The energy (E) of a photon is given as
E = mc2,
E = hν (frequency,ν=c/λ)
E = hc/λ
m =h/λc ————-(2)
substituting equation (2) in equation (1) we get
E = photon energy
h= Planck’s constant(6.62607015×10−34 Js)
λ = wavelength of light
An electron with the same momentum has a 1460 m/s velocity, which is non-relativistic.
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