If `E_1, E_2 and E_3` represent respectively the kinetic energies of an electron, an `alpha - particle` and a proton each having same de-Broglie wavelength, then

Options

A. `E_1gtE_3gtE_2`
B. `E_2gtE_3gtE_1`
C. `E_1gtE_2gtE_3`
D. `E_1=E_2=E_3`

Answer

A

Explanation

`lambda = (h)/(sqrt2Em)`
where, `lambda=constant`
`:. Em = constant`
or `E prop (1)/(m).`