NEET Physics Question - Modern Physics - Photoelectric Effects and deBroglie Equation

Assertion (A): Increase in intensity of light increases the kinetic energy of photoelectrons.

Reason (R): At stopping potential, no current flows in the circuit.

(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A)

(2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(3) (A) is true but (R) is false

(4) Both (A) and (R) are false

Solution:

Assertion (A) is false: Kinetic energy of photoelectrons depends on frequency, not intensity. Reason (R) is true: Stopping potential is the reverse potential that stops all photocurrent. As (A) is false, option (4) is chosen by elimination.

Rankers Physics

Photoelectric Effect & Kinetic Energy

Solution:

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