Question

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
A. 200p
B. 400p
C. `(p)/(200)`
D. 100p

Answer 1

Correct Answer - A
(a) : de Broglie wavelength associated with an electron is
`lamda=(h)/(p)orp=(h)/(lamda):.(Deltap)/(p)=-(Deltalamda)/(lamda)`
`rArr(p)/("Pinitial")=(0.5)/(100)rArr"Pinitial"=200p`