A proton of mass 1.6 × 10⁻²⁷ kg goes round in a circular orbit of radius 0.10 m under a centripetal force of 4 × 10⁻¹³ N. then the frequency of revolution of the proton is about

Options :

1. 0.08 × 10⁸ cycles per sec

2. 4 × 10⁸ cycles per sec

3. 8 × 10⁸ cycles per sec

4. 12 × 10⁸ cycles per sec