## Question

###### The work function of iron metal is 4.50 eV. What is the maximum speed of the...

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

## Answers

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. -

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