Activity of a radioactive sample decreases to `(1//3)^(rd)` of its original value in 3 days. Then, in 9 days its activity will become

Options

A. (1/27) of the original value
B. (1/9) of the original value
C. (1/18) of the original value
D. (1/3) of the original value

Answer

B

Explanation

Just as the time required for the activity to be reduced to half the original value is called half - life, to be reduced to 1/3 of the original activity can be called 1/3 life. There is 2 one third life, the activity will be reduced to `(1//3)^(2)=1//9`.