Show that de Broglie wavelength of electrons accelerated V volt is very nearly given by:
`lamda("in Ã…")=((150)/(V))^(1//2)`

Explanation

`lamda=(h)/(sqrt(2eVm))`
`lamda=[(h^(2))/(2eVm)xx10^(20)]^(1//2)`Ã…
`=[((6.626xx10^(-34))^(2)xx10^(20))/(2xx1.6xx10^(-19)xxVxx9.1xx10^(-31))]^(1//2)=[(150)/(V)]^(1//2)`