A proton of mass 1.6 x 10–27 kg goes round in a circular orbit of radius 0.12 m under a centripetal force of 6 x 10–14 N. Then the frequency of revolution of the proton is about
(A) 1.25 x 106 cycles per second
(B) 2.50 x 106 cycles per second
(C) 3.75 x 106 cycles per second
(D) 5.00 x 106 cycles per second
