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  4. According to Bohr’s theory, the angular momentum for an electron in 5th orbit is

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Q. According to Bohr’s theory, the angular momentum for an electron in $ 5th $ orbit is

UPSEEUPSEE 2010

Solution:

According to Bohr's theory,

angular momentum, $m v r=\frac{n h}{2 \pi}$

For 5 th orbit, $n=5$

$\therefore $ Angular momentum

$=\frac{5 h}{2 \pi}=2.5 \frac{h}{\pi}$