1.

The momentum of a photon is\[2\times {{10}^{-16}}\]gm-cm/sec. Its energy is                                 [CPMT 1974]

A.            \[0.61\times {{10}^{-26}}erg\]                                         
B.            \[2.0\times {{10}^{-26}}erg\]
C.            \[6\times {{10}^{-6}}erg\]      
D.            \[6\times {{10}^{-8}}erg\]
Answer» D.            \[6\times {{10}^{-8}}erg\]


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