Statement-1: Photon has definite momentum though it has no rest mass.
Statement-2: Momentum of photon is due to its energy and therefore it has equivalent mass.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Answer

A

Explanation

Equivalent mass of photon (m) is given from equation.
`E=mc^(2)=hupsilon therefore m=(hupsilon)/(c^(2))`
where E is energy, m is mass, c is speed of light, h is Planck's constant, `upsilon` is frequency.
`therefore" Momentum of photon"=mxx(h upsilon)/(c^(2))xxc=(h upsilon)/(c)`