A radioactive source has an initial activity of

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

Problem

1600\,\text{Bq}

. After some time its activity is found to be

100\,\text{Bq}

. If its half-life is

15\,\text{days}

, the time that has elapsed is (a)

50\,\text{days}

(b)

60\,\text{days}

(c)

75\,\text{days}

(d)

45\,\text{days}