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Question: The momentum of a photon is\(2 \times 10^{- 16}\)gm-cm/sec. Its energy is....

The momentum of a photon is2×10−162 \times 10^{- 16}gm-cm/sec. Its energy is.

A

0.61×10−26erg0.61 \times 10^{- 26}erg

B

2.0×10−26erg2.0 \times 10^{- 26}erg

C

6×10−6erg6 \times 10^{- 6}erg

D

6×10−8erg6 \times 10^{- 8}erg

Answer

6×10−6erg6 \times 10^{- 6}erg

Explanation

Solution

p=Ec⇒E=p×c=2×10−16×(3×1010)=6×10−6erg.p = \frac{E}{c} \Rightarrow E = p \times c = 2 \times 10^{- 16} \times (3 \times 10^{10}) = 6 \times 10^{- 6}erg.