State the proton number, nucleon number and the value of the charge (in terms of the elementary charge eee) on a helium-3 nucleus.
proton number: ....................................................
nucleon number: ....................................................
charge: ....................................................
A nucleus of cesium-137 consists of 55 protons and 82 neutrons. Cesium-137 is radioactive and decays by β−\beta^-β−-emission to an isotope of barium. The symbol for cesium is Cs\text{Cs}Cs and the symbol for barium is Ba\text{Ba}Ba. Write down the nuclide equation of this decay.
The half-life of iodine-131 is 8.0 days. A sample of iodine-131 is in a container. After 24 days, the mass of iodine-131 is 3.5 mg. Calculate the mass of the original sample.
484 exam-style questions on CIE IGCSE Physics 5.2 Radioactivity, covering 5.2.1 Background radiation and measuring count rate, 5.2.2a Alpha, beta and gamma emission, 5.2.2b Deflection and ionising effects of nuclear radiation, 5.2.3a Radioactive decay, 5.2.3b Effects of decay on the nucleus and decay equations, 5.2.4a Half-life, 5.2.4b Choosing isotopes for applications, and 5.2.5 Effects of ionising radiation and safety precautions. Each one has a worked solution and a mark scheme showing where the marks go.