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A proton of mass 1.6times10^-27kg goes r...

A proton of mass `1.6times10^-27`kg goes round in a circular orbit of radius 0.12 m under a certripetal force of `4times10^-13N`. then the frequency of revolution of the proton is about

A

`0.08 xx 10^8` cycles per s

B

`4 xx 10^8` cycles per s

C

`8 xx 10^8` cycles per s

D

`12 xx 10^8` cycles per s

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