It travelling at same speeds, which of the following matter waves have the shortest wavelength?

Options

A. Electron
B. Alpha partice `(He^(2+))`
C. Neutron
D. Proton

Explanation

From de-Brogile equation,
wavelenght `lamdba=(h)/(mv)`.
For same speed of different particles i.e., electron, proton, neutron and a-particle.
`lamdba=(1)/(m)`
As h is constnat, Greater the mass of matter waves. Lesser is wavelength and vice-versa. in these matter waves. alpha particle `(He^(2+))` has higher mass , therefore, shortest wavelength