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According to Bohr’s theory, the angular momentum of an electron I 5^th orbit is

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$2.5 h / π$

$25 h / π$

$2.5 h / π$

$10 h / π$

answer is A.

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Detailed Solution

: In Bohr’s theory , the angular momentum of electron is given $L = n (h / 2 π)$ , where n is the quantum number . For 5^th orbit, n = 5.

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