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Q.

If m is mass of electron, v its velocity, r the radius of stationary circular orbit around a nucleus with charge Ze, then from Bohr's first postulate, the kinetic energy K=12mv2 of the electron in C.G.S. system is equal to

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a

12Ze2r

b

12Ze2r2

c

Ze2r

d

Zer2

answer is A.

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Detailed Solution

In the revolution of electron, coulomb force provides the necessary centripetal force⇒ze2r2=mv2r ⇒mv2=ze2r∴ K.E. =12mv2=ze22r
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