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NEET 1993 (AIPMT) · Transitions, Photon Emission & Excitation

Transitions, Photon Emission & Excitation question from NEET 1993 (AIPMT)

Q81NEET 1993 · AIPMTEasy

Transitions, Photon Emission & Excitation

Hydrogen atoms are excited from ground state of the principle quantum number 4. Then the number of spectral lines observed will be

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Answer: (b)

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

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