A sample of a radioactive substance loses half of its activity in days

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

Problem

A sample of a radioactive substance loses half of its activity in

4

days. The time in which its activity is reduced to

5\%

is (1)

12\text{ days}

(2)

8.3\text{ days}

(3)

17.3\text{ days}

(4) None of these