A hydrogen atom has its electron initially in the fourth Bohr orbit. It directly returns to the second orbit and emits one photon. To which spectral series does this photon belong?
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Question

A hydrogen atom has its electron initially in the fourth Bohr orbit. It directly returns to the second orbit and emits one photon. To which spectral series does this photon belong?

G1 Physics · Accepted Answer

A hydrogen spectral series is identified by the lower level at which the transition ends. Lyman series ends at n = 1. Balmer series ends at n = 2. Paschen series ends at n = 3. Here the electron ends in the second orbit, so the photon belongs to the Balmer series. Correct option: B.