Given below are two statements: one is labelled as Assertion A and… | JEE Main 2024 (4 Apr, Shift 2)

Q12JEE Main 2024 · 4 APR · SHIFT 2Easy

Photons: Energy, Momentum & Radiation Pressure

Given below are two statements: one is labelled as Assertion $\mathbf{A}$ 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:

Show answer and solution

Answer: (a)

Number of photons per second $n = \frac{P}{h\nu}$ : it depends on intensity (power), and for fixed power it actually decreases as $\nu$ rises. So A is false.
$K_{max} = h\nu - \phi$ increases with $\nu$ , so R is true.
So the answer is (a) A is not correct but R is correct.

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