I've got this question wrong 2 times now...

Question

Which of the following statements about the photoelectric effect are correct?

I. If electrons are being ejected, the number of electrons ejected increases with increasing light intensity.

II. The minimum energy required for electron ejection varies for different metals.

III. Electron ejection is independent of both the time the light shines on the metal and the intensity of the light.

Answer 1

http://www.physlink.com/education/askexperts/ae24.cfm