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Ionization potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr’s theory, the spectral lines emitted by hydrogen will be

1. Three
2. Four
3. One
4. Two

Correct answer: Three

Solution

The photon energy of 12.1 eV excites the hydrogen atom from the ground state (n=1) to the second excited state (n=3). From n=3, the atom can transition to n=2, n=1, or directly from n=2 to n=1, resulting in three possible spectral lines.

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