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The time of revolution of an electron around a nucleus of charge Ze in nth Bohr orbit is directly proportional to

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a

n

b

n3Z2

c

n2Z

d

Zn

answer is B.

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Detailed Solution

T=2πrv r = radius of nth orbit =n2h2πmZe2v = speed of e- in nth orbit = =ze22ε0nh∴T=4ε02n3h3mZ2e4⇒T∝n3Z2

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