A proton and an \( \alpha \)-particle enter a uniform magnetic field perpendicularly with the sa...
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0A proton and an \( \alpha \)-particle enter a uniform magnetic field perpendicularly with the same speed. If proton takes \( 25 \mu \mathrm{s} \) to make five revolutions, then the periodic time for the \( \alpha \)-particle would be
(A) \( 50 \mu \mathrm{s} \)
(B) \( 25 \mu \mathrm{s} \)
(C) \( 10 \mu \mathrm{s} \)
(D) \( 5 \mu \mathrm{s} \)
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