If the momentum of an electron is changed by `p`, then the de - Broglie wavelength associated with it changes by `0.5 %`. The initial momentum of electron will be

Options

A. 200 P
B. 400 P
C. `P/200`
D. `100P`

Answer

A

Explanation

de Broglie wavelength associated with an electron is
`lamda = h/P " or " P = h/lamda`
`:. (DeltaP)/(P) =-(Deltalamda)/lamda`
`(P)/(P_("initial") = (0.5)/100 " or " P_("initial ") = 200 P`