With what velocity must an electron travel, so that its momentum is equal to that of a photon of wavelength 663 ~nm ?

Step-by-step solution

aligned & = h m v & v= h m aligned Given, aligned & =663 ~nm & =663 10⁻⁹ ~m h & =6.6 10⁻³⁴ Js m & =9.1 10⁻³¹ ~kg & = 6.6 10⁻³⁴ 9.1 10⁻³¹ 663 10⁻⁹ & =0.0010979 10^6 1098 ~m / s . aligned