Energy and momentum of a photon is given by the expressions, energy E = hv, and momentum $p = \frac{h}{λ}$, respectively, where v is the frequency of photon, h is Plank's constant and λ is the wavelength of the photon. On the basis of the above statement, choose the option which is equal to the velocity of light?
Answer & explanation
Correct answer: option 1
$ \frac{E}{p} = \nu \lambda = v$
$\Rightarrow v = Ep^{-1}$