question_answer 27)

  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 measure 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

Answer:

  Balmer series for hydrogen atom can be observed by measuring the frequencies of light emitted due to transitions between excited states and the first excited state (n = 2). In these measurements, we would find the sequence of frequencies with higher frequencies getting closely packed. Choices (b) and (d) are correct.