A proton and an $\alpha$-particle, having kinetic energies Kp and K$\alpha$ 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 Kp : K$\alpha$ is :

Question

A proton and an $\alpha$-particle, having kinetic energies K_p and K_$\alpha$ 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_$\alpha$ is :

8 : 1

4 : 1

1 : 8

1 : 4

Solution

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