Given below are two statements : one is labelled as Assertion A a… - Vidyadip

MCQ

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 :

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

✓

Answer

Intensity of light $I =\frac{ nh v}{A}$
Here n is no. of photons per unit time.
$n =\frac{ IA }{ hy }$ so on increasing frequency v, n decreases taking intensity constant.
$k _{\max }= h \nu-\phi$ So on increasing , kinetic energy increases.

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