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Hydrogen atoms are excited from ground state to the state of principal quantum number 4. Then, what will be the number of spectral lines observed?(a) 3(b) 6(c) 5(d) 2I had been asked this question during an online interview.I would like to ask this question from Bohr Model of the Hydrogen Atom topic in section Atoms of Physics – Class 12

Answer»

The correct answer is (d) 2

The EXPLANATION: N = 4.

The number of spectral lines emitted = \(\frac {n(n-1)}{2}\).

\(\frac {n (n-1)}{2} = \frac {(4 \times 3)}{6}\) = 2



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