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Question

The radius of the first Bohr orbit is a0. The nth orbit has a radius:

A
na0
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B
a0/n
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C
n2a0
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D
a0/n2
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Solution

The correct option is C n2a0
Radius of nth orbital
rn=ϵ0n2h2πmZe2
Wherein
=rnn2Z

=ϵ0h2πme2=0.529

r=n2Za0

For Z=1 r=n2a0

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