A proton of mass \( 1.6 \times 10^{-27} \mathrm{~kg} \) goes round in a circular orbit of radius...

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A proton of mass \( 1.6 \times 10^{-27} \mathrm{~kg} \) goes round in a circular orbit of radius \( 0.10 \mathrm{~m} \) under a centripetal force of \( 4 \times 10^{-13} \) \( N \). then the frequency of revolution of the proton is about
[Kerala (Med.) 2002]
(a) \( 0.08 \times 10^{8} \) cycles per sec
(b) \( 4 \times 10^{8} \) cycles per sec
(c) \( 8 \times 10^{8} \) cycles per sec
(d) \( 12 \times 10^{8} \) cycles per sec
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