NEET UG PHYSICS MCQ: WAVE OPTICS

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The

21\;cm

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

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Correct option: D

{10^{ - 24}}\;Joule

Option D (

{10^{ - 24}}\;Joule

) is correct because the energy of the emitted wave is very small, corresponding to the hyperfine interaction in atomic hydrogen, and can be calculated using

E = hf

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