Question

What is effective mass of photon having wavelength lambda?

Answer 1

Answer:

An x-ray, like any photon, has zero mass; however it has kinetic energy, which is the energy that can do work. The energy is equal to Planck's constant (h) times the speed of light (c) divided by the x-ray's wavelength. Doing the math, 5.5E-16 is the energy in joules.

Answer 2

Given that,

Wave length = λ

The kinetic energy of photon is

$K.E=\dfrac{hc}{\lambda}$

We need to calculate the effective mass of photon

Using formula of kinetic energy

$K.E=\dfrac{hc}{\lambda}$

$\dfrac{1}{2}mc^2=\dfrac{hc}{\lambda}$

$m=\dfrac{2h}{\lambda c}$

Where, h = planck's constant

$\lambda$ = wave length

c = speed of light

Hence, The effective mass of photon is $\dfrac{2h}{\lambda c}$