A medical imaging team prepares a fresh sample of the radioactive tracer technetium-99m. This metastable isotope has a half-life of 6.0 hours6.0\text{ hours}6.0 hours. Between which values does the decay constant of technetium-99m lie?
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
10−3 s−110^{-3}\text{ s}^{-1}10−3 s−1 and 10−2 s−110^{-2}\text{ s}^{-1}10−2 s−1
10−1 s−110^{-1}\text{ s}^{-1}10−1 s−1 and 100 s−110^{0}\text{ s}^{-1}100 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.