What is the velocity of an electron so that its momentum is equal to the momentum of a photon associated with radiation of wave length 650 nm?

Explanation

Considering the equation `lamda`=h/mv, we can say that wave-length associated with the motion of photon and electron must be the same because they have the same momentum.
Now, for the photon, `lamda=650nm=650xx10^(-9)m`
Again, for the electron, `lamda=(h)/(mv)=(6.626xx10^(-34))/((9.11xx10^(-31))xxv)`
`therefore 650xx10^(-9)=(6.626xx10^(-34))/((9.11xx10^(-31))xxv)`
`or, v=(6.626xx10^(-34))/((9.11xx10^(-31))xx(650xx10^(-9)))=1118.97m*s^(-1)`.