With what velocity (in m/s) must an electron travel so that its momentum is equal to that of photon with a wavelength of λ=5200Å

Momentum of photon p=hλ=6.626×10−345200×10−10kgm/s Momentum of electron =mv=9.1×10−31vwhere v is the velocity of electron.Equating the two momenta, we have.9.1×10−31v=6.626×10−34/5200×10−10⇒v=1400m/s