Two identical samples and of a radioactive substance

PHYSICS · Single correct · CBSE · Physics · Nuclei · Nuclei

Problem

Two identical samples

P

and

Q

of a radioactive substance, having mean life

T

, are observed to have activities

A_P

and

A_Q

, respectively. If

P

is older than

Q

, then the difference in their ages is (1)

T\ln\left(\frac{A_P}{A_Q}\right)

(2)

T\ln\left(\frac{A_Q}{A_P}\right)

(3)

T\left(\frac{A_P}{A_Q}\right)

(4)

T\left(\frac{A_Q}{A_P}\right)