For a photoelectric effect

(A) the photoelectric current is directly proportional to the intensity of the incident radiation.
(B) the maximum kinetic energy of the emiited photoelectrons increases linearly with the frequency of the incident radiation.
(C) for a given frequency of the incident radiation, the stopping potential increases linearly with the intensity of the incident radiation.
(D) the photoelectric emission is an instantanous process without any apparent time lag.

Choose the correct answer from the options given below:

(A), (B) and (D) only

The correct answer is Option (1) → (A), (B) and (D) only

(A) Correct — The number of photoelectrons emitted is proportional to the intensity, so photoelectric current ∝ intensity.

(B) Correct — From Einstein’s photoelectric equation $K_{\max} = h\nu - \phi$, maximum kinetic energy increases linearly with frequency.

(C) Incorrect — Stopping potential depends only on the maximum kinetic energy (hence frequency), not on the intensity.

(D) Correct — Photoelectric emission is instantaneous without time lag.

Final Answer: (A), (B), (D)