Photoelectron Emission Ratio – Rankers Physics

Photoelectric Effects and deBroglie Equation: Practice Problem & Solution

Assertion (A): In photoelectric effect, the number of photoelectrons emitted is always equal to number of photons incident. Reason (R): All the photons falling on the surface will eject photoelectrons.  
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
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:

The number of emitted photoelectrons is generally less than the number of incident photons due to quantum efficiency and reflection losses. Photons can only eject electrons if their energy \(\text{h}\nu\) exceeds the work function \(\phi\). Both assertion (A) and reason (R) 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Your email address will not be published.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 frequency of \(K_\alpha\) X-radiations is greater than \(K_\beta\) for a given target. Reason (R): \(K_\alpha\) radiation is produced when an electron from \(n = 2\) jumps into the vacancy in \(n = 1\) orbit, whereas in \(K_\beta\) radiation the transition takes place from \(n = 3\) to \(n = 2\).  
2. The energy of a hydrogen atom in its ground state is $-13.6 eV$. The energy of the level corresponding to the quantum number $n = 2$ in the hydrogen atom is (1996)
3. Assertion (A): Wavelength of continuous X-ray varies from a minimum value to infinity. Reason (R): Continuous X-rays are emitted due to transition of electron from higher to lower energy level.  
4. In the nucleus of $ _{11}Na^{23} $, the number of protons, neutrons and electrons are (1991)
5. 40. Who evaluated the mass of electron indirectly with the help of charge: (2000)