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Question

Radius of 3rd Bohr orbit of hydrogen atom is:

A
6.59Ao
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B
2.116Ao
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C
4.761Ao
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D
8.464Ao
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Solution

The correct option is C 4.761Ao
The radius of an orbit is given by,

r=n2h24π2mZe2

Substituting the values of h,m,z=1 for hydrogen and the electron charge army be calculated as

r=0.529×n2A0

For n=3

r=4.761A0

Hence, the correct option is C

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