Physics-(general)
NEET Physics (general) Assertion Reason Question
Type: Assertion Reason-assertion-Easy-Class 12
Assertion (A): The energy required to emit an electron from a metal surface can be provided by thermionic emission. | Reason (R): Heating a metal imparts sufficient thermal energy to its free electrons for emission.
A
Both A and R are true, and R is the correct explanation of A.
B
Both A and R are true, but R is not the correct explanation of A.
C
A is true, but R is false.
D
A is false.
Correct Answer
Option A
Detailed Explanation
Both the assertion and reason are true, and the reason correctly explains the assertion. Heating a metal is a valid method to supply energy to electrons, facilitating thermionic emission, as indicated in the NCERT context.
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