Question

The de-Broglie wavelength of a proton and ∝-particle is same. The ratio of their velocities will be ______ .
[∝-particle is the He-nucleus, having two protons and two neutrons. Thus, its mass m∝ ≈ 4mp ; where mp is the mass of the proton.]
(A) 1 : 4
(B) 1 : 2
(C) 2 : 1
(D) 4 : 1

Answer 1

the ratio of their velocities will be 4:1