Assertion (A) : Half life of a radioactive isotope is the time required to decrease its mass number by half
Reason (R ) : Half life of radioactive isotope is independent of the initial amount of the isotope a)If both (A) and (R ) are correct, and (R ) is the correct explaination of (A) b)If both (A) and (R ) are correct, but (R ) is not the correct explaination of (A) c)If (A) is correct,but (R ) is incorrect d)If both (A) and (R ) are incorrect.

Options

A. If both (A) and (R ) are correct and (R ) is the correct explanation for (A).
B. If both (A) and (R ) are correct but (R ) is not the correct explanation for (A )
C. If both (A) and (R ) are incorrect.
D. If both (A) and (R ) are incorrect.

Answer

D