CAPE Physics Unit 2 · 2019 · Paper 1 · Question Q45

The activity of a radioactive isotope is found to fall to 1/16 of its initial value in 2 hours. What is the half-life of the isotope?

1. (A)7.5\text{ minutes}
2. (B)30\text{ minutes}
3. (C)1\text{ hour}
4. (D)2\text{ hours}