Q 1232134032.    

Assertion : `alpha`-particles are fast moving electrons.

Reason : `α`-particles are stopped by a few sheets of paper or a very thin metal foil.

A Both A and R individually true and R is the correct explanation of A
B Both A and R are individually true but R is not the correct explanation of A
C A is true but R is false
D A is false but R is true

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