A proton and an alpha particle both enter a region of uniform magnetic field B, moving at right angles to the field B. If the radius of circular orbits for both the particles is equal and the kinetic energy acquired by proton is 1MeV, the energy acquired by alpha particle will be :

Question

( A ) 1.5 MeV
( B ) 1 MeV
( C ) 4 MeV
( D ) 0.5 MeV