A sample of a radioisotope reduces to one-third of its initial mass in minutes

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

Problem

A sample of a radioisotope reduces to one-third of its initial mass in

15\,

minutes. The half-life of this isotope (nearest minute) is (a)

10.0\,\text{min}

(b)

9.5\,\text{min}

(c)

7.5\,\text{min}

(d)

11.3\,\text{min}