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Askiitians Expert
Anil Pannikar
IIT Bombay
when frequency is f then max kinetic energy is 1.2ev
(KE) = hf -@ (@ is work function)
1.2 = hf - @ .......1
when frequency increased by 50% then new frequency is f+f/2 =3f/2 and
(KE)max = 3hf/2 - @
4.2 = 3hf/2 - @ ................2
from 1 & 2
@ = 4.8ev ans
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