A freshly prepared radioactive source of half-life emits radiation of intensity times…

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

Problem

A freshly prepared radioactive source of half-life

2\text{ h}

emits radiation of intensity

64

times the permissible safe level. The minimum time after which it would be possible to work safely with this source is (1)

6\text{ h}

(2)

12\text{ h}

(3)

24\text{ h}

(4)

128\text{ h}