When electron jumps from $n = 4$ level to $n = 1$ level, the angular momentum of electron changes by

\frac{h}{2 π}

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\frac{2 h}{2 π}

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\frac{3 h}{2 π}

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\frac{4 h}{2 π}

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Solution

The correct option is A $\frac{3 h}{2 π}$
Angular momentum of electron in nth state, $J_{n} = \frac{n h}{2 π}$
Change in angular momentum, $Δ J = (n_{1} - n_{2}) \frac{h}{2 π}$
$∴$ $Δ J = \frac{(4 - 1) h}{2 π} = \frac{3 h}{2 π}$

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\frac{4 h}{2 π}

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