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Questions  

A proton and an α-particle  enter a uniform magnetic field perpendicularly with the same speed. If proton takes 25 μs to make 5 revolutions, then the periodic time for the α-particle  would be

a
50 μs
b
25 μs
c
10 μs
d
5 μs

detailed solution

Correct option is C

Time period of proton, Tp=255=5μs∵T=2πmqB⇒TαTp=mαmp×qpqα=4mpmp×qp2qp⇒  Tα  =2TP = 10 μs

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