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Question

The orbit number for a circular orbit of diameter 20 nm for the hydrogen atom is:

A
10
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B
14
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C
12
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D
16
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Solution

The correct option is B 14
Bohr radius is given as, rn=0.529n2×1010m.
Given that, diameter =20 nm
Radius =10nm=10×109m
Using Bohr radius equation: n2=10×1090.529×1010=1000.529
n14

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