Question

The relativistic mass of photon of wavelength 5, 0000A°
1)3.45×10^-36 kg
2)3.45×10^-35 kg
3)4.4×10^-35 kg
4)4.4×10^-36 kg

Answer 1

The relativistic mass of photon is

$$m=\frac{h}{c\times\lambda}$$

where h - Planck constant;

c - speed of light;

$\lambda$ - wavelenght of photon.

So,

$$m=\frac{6.63\times10^{-34}}{3\times10^8\times5\times10^{-6}}=4.4\times10^{-35} kg$$