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JEE Main 2021 (27 Aug, Shift 2) · Transitions, Photon Emission & Excitation

Transitions, Photon Emission & Excitation question from JEE Main 2021 (27 Aug, Shift 2)

Q47JEE Main 2021 · 27 AUG · SHIFT 2Easy

Transitions, Photon Emission & Excitation

X different wavelengths may be observed in the spectrum from a hydrogen sample if the atoms are excited to states with principal quantum number n = 6? The value of X is ______________.

Numerical answer type. Work it out, then open the answer.

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Answer: 15

Number of different wavelengths from level $n$ $= \frac{n(n-1)}{2}$
$n = 6$ : $\frac{6\times5}{2} = 15$
So $X = 15$ .

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