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A proton and an alpha- particle, having ...

A proton and an `alpha`- particle, having kinetic energies `K_P and K_a` respectively enter into a magnetic field at right angles. The ratio of the radii of trajectory of proton to that of `alpha-` particle is 2:1. The ratio of `K_p : K_a` is :

A

`1:8`

B

`8:1`

C

`1:4`

D

`4:1`

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