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Questions  

The electric potential between a proton and an electron is given by V=V0lnrr0, where r0 is a constant. Assuming Bohr's model to be applicable, write the variation of rn,
n being the principal quantum number

a
rn∝n
b
rn∝1/n
c
rn∝n2
d
rn∝1/n2

detailed solution

Correct option is A

Potential energy U=eV=eV0ln⁡rr0  Force F=−dUdr=eV0rr0 . Therefore the force will provide the necessary centripetal force. Hence, mv2r=eV0rr0 ⇒v=eV0mr0………(i)and mvr=nh2π………(ii) From equations (i) and (ii),  meV0mr0⋅r=nh2π  ⇒ r=nh2πr0meV0   ⇒ rn∝n

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