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The Balmer series for the H-atom can be ...

The Balmer series for the H-atom can be observed.

A

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

B

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

C

in any transition in a H-atom.

D

as a sequence of frequencies with the higher frequencies getting closely packed.

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