<p>We can say that the energy of a photon of frequency v is given by E = hv, where h is Planck&#39;s constant. The momentum of a photon is p = h/<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>&#955;</mi></math>, where&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>&#955;</mi></math>&nbsp;is the wavelength of photon. Then we may conclude that velocity of light is equal to:</p>