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The momentum of a photon is 2 xx 10^(-16...

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

A

`0.61xx10^(-26)` erg

B

`2.0xx10^(-26)` erg

C

`6xx10^(-6) ` erg

D

`6xx10^(-8)` erg

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