The Balmer series for the $H$ -atom can be observed,

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in any transition in a $H$ -atom.

if we measure the frequencies of light when an exited atom falls to second excited state.

if we measure the frequencies of light emitted when an excited atom falls to the ground state.

if we measure the frequencies of light emitted due to transitions between excited states and the first excited state.

answer is B.

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Detailed Solution

Balmer series occurs when an electron jumps from higher energy states (n > 2 ) to first excited state (n = 2), hence we can observe Balmer series of H-atom by measuring the frequency of light emitted due to transition between second (or higher) excited states and first excited state.

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