The ratio of specific charge of a proton and an alpha-particle is :

The ratio of specific charge of a proton and an prop-particle is :

The ratio of the e/m values of a proton and an alpha -particle is:

The ratio of velocities of a proton and "alpha" particle is 4 : 1 The ratio of their De Broglic wave length will be

The ratio of specific charge of an alpha- particle to that of a proton is

The ratio of the e//m (specific charge) values of an electron and an alpha-"particle" is