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Question

If the radius of 3rd Bohr’s orbit of H-atom is r, then the radius of 4th Bohr’s orbit of He+ would be

A
r×43
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B
r×169
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C
r×89
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D
r×98
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Solution

The correct option is C r×89
The Bohr's radii are given by the expression, rn=n2r0Z
From the question,
r3=r=32r01
r0=r9
Bohr's theory can be applied for hydrogen like atom. So,
r4(He+)=42r02=8r9

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