The momentum of a photon is `2 xx 10^(-16) gm - cm//sec`. Its energy is

Options

A. `0.61 xx 10^(-26) erg`
B. `2.0 xx 10^(-26) erg`
C. `6 xx 10^(-6) erg`
D. `6 xx 10^(-8) erg`

Answer

C

Explanation

`p = (E)/(c) rArr E = p xx c = 2 xx 10^(-16) xx ( 3 xx 10^(10))`
`= 6 xx 10^(-6) erg.`