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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

(a) n             (b) n2Z2
(c) n2Z          (d) Zn

(b) T=2πrv  ; r = radius of nth orbit= n2h2πmZe2

v = speed of e- in nth orbit = ze22ε0nh

T=4ε02n3h3mZ2e4Tn3Z2

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