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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

`5mus`

B

`8 mus`

C

`10mus`

D

`16mus`

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The correct Answer is:
D
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