# Statement-1: The kinetic energy of an electron is greater than $\mathrm{\alpha }$-particle having same momentum.Statement-2: Mass of $\mathrm{\alpha }$-particle is greater than the mass of electron.

1. A

Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1.

2. B

Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.

3. C

Statement-1 is true, statement-2 is false.

4. D

Statement-1 is false, statement-2 is true.

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### Solution:

Momentum$=\sqrt{2\mathrm{mKE}}$

Mass of a particle is more than mass of electron

thus $\frac{{\mathrm{m}}_{\mathrm{\alpha }}}{{\mathrm{m}}_{\mathrm{e}}}>1$; this $\frac{{\mathrm{KE}}_{\mathrm{e}}}{{\mathrm{KE}}_{\mathrm{\alpha }}}>1$

Thus statement-1 is true.
Statement-2 is also true.

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