The 21 cm radio wave emitted by hydrogen...

The `21 cm` radio wave emitted by hydrogen in interstellar space is due to the interaction called the hyperfine interaction in atomic hydrogen. The energy of the emitted wave is nearly

A

`10^(-17)`

B

`1 J`

C

`7 xx 10^(-6)J`

D

`10^(-24)`J

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The correct Answer is:

D

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