Work Function & Intensity – Rankers Physics

Photoelectric Effects and deBroglie Equation: Practice Problem & Solution

Assertion (A): Work function of a metal increases with increase in intensity of incident light. Reason (R): Maximum kinetic energy of ejected photoelectrons depends upon the intensity of incident light.  
(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

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Photoelectric Effects and deBroglie Equation. Understanding the underlying formula is key to arriving at the correct answer below:

Assertion (A) is false: Work function is a characteristic property of the metal and is independent of light intensity.

Reason (R) is false: Maximum kinetic energy depends on frequency, not intensity. Both statements are false.

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