Chemistry - Atomic Structure Question with Solution | TestHub

The photoelectric effect depends on frequency, not intensity.

(A) False

If green light ejects electrons, the threshold frequency is lower than green.

Red has a lower frequency, so it cannot always eject electrons, but the statement says "never" in an absolute sense, which is conceptually misleading in an exam context.

(B) True

Even if red light has very high intensity, if its frequency is less than the threshold, no emission occurs.

(C) True

Blue light has a higher frequency, which means more photons are above the threshold, leading to a higher photocurrent if the intensity is sufficient.

(D) True

Higher frequency (blue) gives higher kinetic energy:

$$K_{max}=h\nu -\varphi$$