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Q.

Statement-1: The kinetic energy of an electron is greater than α-particle having same momentum.
Statement-2: Mass of α-particle is greater than the mass of electron.

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a

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

b

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

c

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

d

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

answer is A.

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Detailed Solution

Momentum=2mKE

Pe=Pα 2me.KEe=2mα.KEα meKE=mαKEα KEeKEα=mαme

Mass of a particle is more than mass of electron

thus mαme>1; this KEeKEα>1

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

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