Question

Given below are two statements:
Assertion (A): In photoelectric effect there is no time lag \((\sim10^{-9}s)\) between incidence of photon and emission of photoelectrons.
Reason (R): This is because electromagnetic wave energy is concentrated in photons and not spread out, so there should be no delay in the emission of electrons.

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is correct but (R) is not correct
• D. (A) is not correct but (R) is correct

Hint:

Instantaneous emission in photoelectric effect is explained by photon theory of light.

Answer 1

The Correct Option is A