Question

10)
DULILU OXU
1) Wuli au
The work function of caesium metal is 2.12 eV.
When light of wavelength 3000 Å is incident on
the metal surface, photoemission of electrons oc-
curs. Maximum speed of emitted photoelectrons is
approximately
(133)
(1) 420 km/s
(2) 540 km/s
(3) 600 km/s
(4) 842 km/s​

Answer 1

4) 842 km/s will be the right answer