Two protons are having same kinetic energy. One proton enters a uniform magnetic field at right angles ot it. Second proton enters a uniform electric field in the direction of field. After some time their de Broglie wavelengths are `lambda_1 and lambda_2` then (a) `lambda_1 = lambda_2` (b) `lambda_1 lt lambda_2` (c) `lambda_1 gt lambda_2` (d) some more information is required

Options

A. `lamda _(1) =lamda_(2)`
B. `lamda_(1) =lamda_(2)`
C. `lamda_(1) lt lamda_(2)`
D. Depends on direction of electric field

Answer

D

Explanation

In magnetic field, velocity of the electron doesn't change. But in electric field, velocity may increase or decreases depends on direction of electric fiels