Calculate the wave length of an electron of mass `9.1 xx 10^(-31) kg`, moving with a velocity of `2.05 xx 10^(7)ms^(-1)`.

Explanation

Mass of electron, `m = 9.1 xx 10^(-31) kg`
v = velocity of electron = `2.05 xx 10^(7) ms^(-1)`
h = Plancks constant `= 6.6256 xx 10^(-34) Js`.
`lambda` = wave length = ?
`lambda = (h)/(mv) = (6.625 xx 10^(-34) kgm^(2)s^(-1))/(9.1 xx 10^(-31)kg xx 2.05 xx 10^(7) ms^(-1))`
The wave length of electron is `3.55 xx 10^(-11)m`