Question

The work function of iron metal is 4.50 eV. What is the maximum speed of the photoelectrons ejected from iron, when light with a wavelength of 142 nm is shined on its surface? 1.22E6 m/s 6.32E5 m/s 8.99E5 m/s 9.51E6 m/s 1.09E6 m/s

Answer 1

sont ! of metal & we know that maximum kinetic energy of emitted electron in photo electric effects is given by work function hoc E = speed photo electron (max) < (3.1 272"] ze} = (6.626 ****9 (741) (142*109) f of he res ž mere²= o 2 > 4.5*(1.6725'9) j 6 -> 2= 1. 2225 * 10 slu S & maximum speed of timmited electron. -