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if a is the radius of first Bohr orbit i...

if a is the radius of first Bohr orbit in hydrogen atom, the radius of `3^rd` orbit is

A

3a

B

9a

C

27a

D

81a

Text Solution

Verified by Experts

The correct Answer is:
b
In Bohr's orbit is ,`r=propn^2`
`r_1/r_2=((n_1)/n_2)^2`
`implies a/r_2=(1/3)^2`
`implies e_2=9a`
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