Hydrogen atoms at ground state absorb monochromatic radiation of photon energy 12.1 eV. The spectral lines subsequently emitted according to Bohr’s theory are:
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Question

Hydrogen atoms at ground state absorb monochromatic radiation of photon energy 12.1 eV. The spectral lines subsequently emitted according to Bohr’s theory are:

G1 Physics · Accepted Answer

The initial level n is determined by 13.6(1 − 1/n²) ≈ 12.1 eV, so n = 3. Possible emission transitions are 3→2, 3→1 and 2→1. Number of distinct spectral lines is n(n − 1)/2 = 3. The correctly printed option is C (three). Answer: C.