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If the radius of 1st Bohr orbit in hydro...

If the radius of 1st Bohr orbit in hydrogen atom is `0.5 A^@` 'then radius of 3rd Bohr orbit is

A

`45 overset(@) (A)`

B

`4.5 overset (@) (A)`

C

`1.5 overset (@) (A)`

D

`0.166 overset(@) (A)`

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