VITEEE 2012 Paper

Threshold energy of A EA = hvA
= 6.6 x 10−34 x 1.8 x 1014
= 11.88 x 10−20 J
=

11.88×10−20

1.6×10−19

eV = .74 eV
Similarly, EB = 0.91 eV
As the incident photons have energy greater than EA but less than EB
So, photoelectrons will be emitted from metal A only.