Question

When ultraviolet radiation of wavelength 165 nm strikes a certain metal surface, electrons are ejected with a speed of 1.24 Mm s−1 (1 Mm = 106 m). Calculate the speed of electrons ejected by radiation of wavelength 265 nm.

Answer 1

I tried using
E=hv-phi
Where v=c/lamda
but I got a solution that does not agree with my professors value.

735km/s

Answer 2

Check your units for each value given.