The wavelength 21 cm emitted by atomic hydro | vedclass

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(A) The electromagnetic spectrum is classified based on wavelength and frequency. Radio waves cover a broad range of wavelengths,typically from $1 \ m

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Radio waves

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(A) The electromagnetic spectrum is classified based on wavelength and frequency. Radio waves cover a broad range of wavelengths,typically from $1 \ mm$ to $100 \ km$. Since $21 \ cm$ falls within the range of $1 \ mm$ to $100 \ km$,it is classified as a radio wave. Specifically,this is known as the $21 \ cm$ hydrogen line,which is a significant tool in radio astronomy.

The wavelength $21 \ cm$ emitted by atomic hydrogen in interstellar space belongs to

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