CAPE Physics Unit 2 · 2010 · Paper 1 · Question Q42

The activity of a radioactive isotope is found to fall to \frac{1}{16} of its initial value in 2\text{ hrs}. What is the half-life of the isotope?

1. (A)7.5\text{ mins}
2. (B)30\text{ mins}
3. (C)1\text{ hr}
4. (D)2\text{ hrs}