A Bohr hydrogen atom undergoes a transition \( n=5 \) to \( n=4 \) and emits a photon of frequen....

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A Bohr hydrogen atom undergoes a transition \( n=5 \)
\( \mathrm{P} \)
to \( n=4 \) and emits a photon of frequency \( f \). Frequency of circular motion of electron in \( n=4 \) orbit is \( f_{4} \). The ratio \( f / f_{4} \) is found to be \( 18 / 5 \mathrm{~m} \). State the value of \( \mathrm{m} \).


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