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.
Correct Answer: B
Solution :
b-particles are emitted with very high velocity (up to 0.99 c). So, according to Einstein?s theory of relatively, the mass of a b-particle is much higher compared to is` its rest mass \[({{m}_{0}}).\] The velocity of electrons obtained by other means is very small compared to c (Velocity of light). So its mass remains nearly \[{{m}_{0}}.\] But b-particle and electron both are similar particles.
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