Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Number of photons increases with increase in frequency of light.
Reason R : Maximum kinetic energy of emitted electrons increases with the frequency of incident radiation.
In the light of the above statements, choose the most appropriate answer from the options given below :
Assertion A : Number of photons increases with increase in frequency of light.
Reason R : Maximum kinetic energy of emitted electrons increases with the frequency of incident radiation.
In the light of the above statements, choose the most appropriate answer from the options given below :
- (A)Both and are correct and is NOT the correct explanation of .
- (B) is correct but is not correct.
- (C)Both and are correct and is the correct explanation of .
- (D) is not correct but is correct.✓ Correct
Answer: (D)
Solution
Photon flux: , so . At constant intensity , increasing frequency *decreases* the number of photons per second — so Assertion A (that photon number increases with frequency) is false.
Reason R is correct: by the photoelectric effect, , which increases with frequency.
So A is false, R is true — option (4).
Reason R is correct: by the photoelectric effect, , which increases with frequency.
So A is false, R is true — option (4).
JEE Main · 2024 · 04 Apr 2024 · Shift 2 · Single correct option