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Question

Chemistry Question on Bohr’s Model for Hydrogen Atom

According to Bohr?? theory, the angular momentum of an electron in 5th orbit is :

A

25hπ25 \frac{h}{\pi}

B

1.0hπ1.0 \frac{h}{\pi}

C

10hπ10\frac{h}{\pi}

D

2.5hπ2.5\frac{h}{\pi}

Answer

2.5hπ2.5\frac{h}{\pi}

Explanation

Solution

Angular momentum of an electron =mvr=nh2π=mvr=\frac{n h}{2\pi} (n is orbit mumber) in 5th orbit =5h2π\frac{5h}{2\pi} =2.5hπ=\frac{2.5 h}{\pi}