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JEE Main 2012 (AIEEE) · Transitions, Photon Emission & Excitation

Transitions, Photon Emission & Excitation question from JEE Main 2012 (AIEEE)

Q67JEE Main 2012 · AIEEEEasy

Transitions, Photon Emission & Excitation

Hydrogen atom is excited from ground state to another state with principal quantum number equal to $4.$ Then the number of spectral lines in the emission spectra will be:

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Answer: (d)

Number of lines from level $n$ $= \frac{n(n-1)}{2}$
$n = 4$ : $\frac{4\times3}{2} = 6$
So the answer is (d) $6$ .

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