Q. The momentum of a photon is $2 \times 10^{- 16}\ gm$-$cm/sec.$ Its energy is
A) $0.61 \times 10^{- 26}erg$
B) $2.0 \times 10^{- 26}erg$
C) $6 \times 10^{- 6}erg$
D) $6 \times 10^{- 8}erg$
Explanation
(c) $p = \frac{E}{c} \Rightarrow E = p \times c = 2 \times 10^{- 16} \times \left( 3 \times 10^{10} \right) = 6 \times 10^{- 6}erg$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.