Dual Nature Of Light Question 3
Question: Assertion : When the speed of an electron increases its specific charge decreases. Reason : Specific charge is the ratio of the charge to mass. [AIIMS 2001]
Options:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Show Answer
Answer:
Correct Answer: B
Solution:
Charge does not change with speed but mass varies with the speed as per relation $ m=\frac{m_{0}}{\sqrt{1-\frac{v^{2}}{c^{2}}}} $ . Hence specific charge e/m decreases with increase in speed.
BETA
