CAPE Physics Unit 2 · 2015 · Paper 1 · Question Q43

The activity of a radioactive isotope is found to fall to \frac{1}{16} of its initial value in 2\text{ 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}