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A proton and an alpha-particle enter a u...

A proton and an `alpha-`particle enter a uniform magnetic field moving with the same speed. If the proton takes `25 mu s` to make 5 revolutions, then the periodic time for the `alpha-` particle would be

A

`50 mu sec`

B

`25 mu sec`

C

`10 mu sec`

D

`5 mu sec`

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The correct Answer is:
C
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