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  • 21cm radiowave emitted by hydrogen in intersteller space is due to the interaction called the hyperfine interaction, is atomic hydrogen, the energy of the emitted wave is nearly  </p

21cm radiowave emitted by hydrogen in intersteller space is due to the interaction called the hyperfine interaction, is atomic hydrogen, the energy of the emitted wave is nearly

 

Option: 1

\mathrm{10^{-17}\: J}


Option: 2

\mathrm{1\: J}


Option: 3

\mathrm{7 \times 10^{-8}\: J}


Option: 4

\mathrm{10^{-24}\: J}


Answers (1)

best_answer

\mathrm{E=\frac{h c}{\lambda}=\frac{6.6 \times 10^{-34} \times 3 \times 10^8}{21 \times 10^{-2}}=10^{-24} \mathrm{~J}}

Posted by

Ritika Jonwal

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