Photoelectric Effect & Intensity – Rankers Physics

Atomic Structure: Practice Problem & Solution

Assertion (A): In photoelectric effect, on increasing the intensity of light, both the number of electrons emitted and kinetic energy of each of them get increased but photoelectric current remains unchanged. Reason (R): The photoelectric current depends only on wavelength of 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 Atomic Structure. Understanding the underlying formula is key to arriving at the correct answer below:

Assertion (A) is false: Increasing intensity increases number of electrons and current, but KE remains same. Reason (R) is false: Photoelectric current depends on intensity and frequency. 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Your email address will not be published.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. The K.E. of electron and photon is same then relation between their De-Broglie wavelength: (1999)
2. Fusion reaction takes place at high temperature because: (2011 Pre)
3. Assertion (A): Rydberg constant varies with mass number of a given element. Reason (R): The reduced mass of electron depends on the mass of the nucleus.  
4. In the nuclear decay given below: $^{A}_{Z}X \rightarrow ^{A}_{Z+1}Y \rightarrow ^{A-4}_{Z-1}B^* \rightarrow ^{A-4}_{Z-1}B$, the particles emitted in the sequence are: (2009)
5. Which of the following statements is true for nuclear forces? (1990)