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NEET 2006 (AIPMT) · Transitions, Photon Emission & Excitation

Transitions, Photon Emission & Excitation question from NEET 2006 (AIPMT)

Q76NEET 2006 · AIPMTMedium

Transitions, Photon Emission & Excitation

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 emited by hydrogen will be

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Answer: (c)

  1. After absorbing 12.1 eV: E=−13.6+12.1=−1.5E = -13.6 + 12.1 = -1.5 eV ≈E3\approx E_3, so n=3n = 3.
  2. Lines =n(n−1)2=3×22=3= \frac{n(n-1)}{2} = \frac{3 \times 2}{2} = 3 (3→13\to1, 3→23\to2, 2→12\to1).
  3. So the answer is (c) three.
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