A radioactive source used in industrial thickness gauges contains a nuclide with a half-life of 12 days12\text{ days}12 days. The decay constant, λ\lambdaλ, for this nuclide lies between:
10−8 s−110^{-8}\text{ s}^{-1}10−8 s−1 and 10−7 s−110^{-7}\text{ s}^{-1}10−7 s−1
10−7 s−110^{-7}\text{ s}^{-1}10−7 s−1 and 10−6 s−110^{-6}\text{ s}^{-1}10−6 s−1
10−6 s−110^{-6}\text{ s}^{-1}10−6 s−1 and 10−5 s−110^{-5}\text{ s}^{-1}10−5 s−1
10−5 s−110^{-5}\text{ s}^{-1}10−5 s−1 and 10−4 s−110^{-4}\text{ s}^{-1}10−4 s−1
128 exam-style questions on AQA A Level Physics Radioactivity (A-level only), covering Rutherford scattering (A-level only), $\alpha$ , $\beta$ and $\gamma$ radiation (A-level only), Radioactive decay (A-level only), Nuclear instability (A-level only), Nuclear radius (A-level only), Mass and energy (A-level only), Induced fission (A-level only), and Safety aspects (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.