A detector records disintegrations from a radioactive sample during the first and…

PHYSICS · Single correct · A Level · Physics · Nuclear physics · Nuclear physics

Problem

A detector records

640

disintegrations from a radioactive sample during the first

10\,\text{min}

and

512

disintegrations during the next

10\,\text{min}

. Assuming no material is added or removed, the half-life of the isotope is approximately (a)

25\,\text{min}

(b)

31\,\text{min}

(c)

34.6\,\text{min}

(d)

15.5\,\text{min}