Read the following features of the Photoelectric effect.
(A) The maximum kinetic energy of the photoelectrons varies linearly with the frequency of incident radiation
(B) The maximum kinetic energy of the photoelectrons is dependent on its intensity.
(C) For a frequency of incident radiation, lower than the cut-off frequency, photoelectric emission is possible even if the intensity is not large.
(D) Ultraviolet light can eject photoelectrons from copper even if visible light does not eject
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A) and (D) only
(A) ✔ Correct — $K_{max}$ varies linearly with frequency: $K_{max} = hf - \phi$.
(B) ✘ Incorrect — $K_{max}$ does not depend on intensity, only on frequency.
(C) ✘ Incorrect — if frequency $< f_{0}$, no photoelectric emission occurs regardless of intensity.
(D) ✔ Correct — UV has higher frequency (energy) than visible light, so it can eject electrons from copper.
Correct statements: (A) and (D)