Find the initial momentum of electron if the momentum of electron is changed by `p_(m)` and the De Brogile wavelength associated with it changed by `0.50%`

Explanation

`(dlambda)/(lambda) xx 100 = 0.5 rArr (dlambda)/(lambda) = (0.5)/(100) = (1)/(200)` and `Deltap = p_(m)`
`:' p = h/lambda`, differenting `(dp)/(dlambda) = -(hc)/(lambda^(2)) = - (hc)/(lambda) xx 1/(lambda) = - (p)/(lambda) rArr (|dp|)/(p) = (dlambda)/(lambda)`
`:. (p_(m))/(p) = (1)/(200) rArr p = 200 p_(m)`