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

Solution Explained:

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.

Leave a Reply

Your email address will not be published. Required fields are marked *

Similar Practice Questions

Explore conceptually related problems to test your knowledge.

1. Assertion (A): The value of Rydberg constant is independent of mass of nucleus. Reason (R): Electrons revolve around stationary nucleus of atom.
2. Assertion (A): Cut-off wavelength of x-ray is independent of type of target metal Reason (R): Wavelength of \(K_{alpha}\) x-ray depends upon type of target metal.  
3. The de Broglie wavelengths of a proton and an \(\alpha\)-particle are \(3\lambda\) and \(\lambda\) respectively. The ratio of the velocities of proton to \(\alpha\)-particle is
4. In the nucleus of $ _{11}Na^{23} $, the number of protons, neutrons and electrons are (1991)
5. Momentum of photon wavelength $\lambda$ is (1993)