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

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

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

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

The ratio of velocities of a proton and an alpha particle is 4 : 1. The ratio of their De Broglie wave lengths will be

The ratio of velocities of a proton and an alpha particle is 4 : 1. The ratio of their De Broglie wave lengths will be

The (e)/(m) value of proton is