how fast is an electron moving if it has a wavelength equal to the distance traveled in one second ?

Explanation

Here `v = lamda`. Hence, `lamda = (h)/(mv) " gives" v^(2) = (h)/(m)`
or `v = sqrt((h)/(m)) = sqrt((6.626 xx 10^(-34))/(9.1 xx 10^(-31))) = 2.698 xx 10^(-2) ms^(-1)`