A:Photon do not have mass then also it possess momentum.
R:Momentum of photon is due to energy and energy is equivalent to mass.

Options

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

Answer

A

Explanation

Both assertion and reason are true and the reason is correct explanation of the assertion.
According toEinstein theory mass and energy are proportional to each other.
`Eprop m`
`therefore E=mc^(2)` Where c=speed of lighy in vaccum
but E=hf
`therefore hf=mc^(2)`
`therefore m=(hf)/(c^(2))`
`therefore mc=(hf)/(c )`
`therefore p=(hf)/(c )[because mc =p]`