A metal surface is struck with light of wavelength 430 nm releasing a stream of electrons. If the 430 nm light is replaced by 380 nm light of the same intensity, what is the result?

Question

a.
no change to the emitted electrons
b.
emitted electrons are more energetic
c.
more electrons are emitted in a given time interval
d.
fewer electrons are emitted in a given time interval
e.
emitted electrons are less energetic

Answer 1

b.
emitted electrons are more energetic

Einstein's relation for phptoelectric effect: hc/λ=v W= KE,
λ↓ KE↑