Which of the following is true for the number | vedclass

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(B) The number of possible spectral lines for a transition from an excited state $n$ to a lower state $n_f$ is given by $N = \frac{(n - n_f)(n - n_f +

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Decreases

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(B) The number of possible spectral lines for a transition from an excited state $n$ to a lower state $n_f$ is given by $N = \frac{(n - n_f)(n - n_f + 1)}{2}$. As we move from the Lyman series $(n_f = 1)$ to the Pfund series $(n_f = 5)$,the number of available transitions for a fixed upper energy level $n$ decreases because the gap between the upper level and the lower level becomes smaller. Therefore,the number of spectral lines decreases.

Which of the following is true for the number of spectral lines when going from the Lyman series to the Pfund series?

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