CAPE Physics Unit 2 · 2009 · Paper 1 · Question Q45

The half-life of a sample of radioactive substance is 100\text{ years}. What is its decay constant?

1. (A)6.93 \times 10^{-3}\text{ year}^{-1}
2. (B)5.00 \times 10^1\text{ year}^{-1}
3. (C)6.93 \times 10^1\text{ year}^{-1}
4. (D)1.44 \times 10^2\text{ year}^{-1}