A radioactive isotope has a half-life of 3 days. At the start of an experiment, a sample of the isotope emits 4000 α\alphaα-particles per minute.
How many α\alphaα-particles per minute will it emit after 12 days?
250
500
1000
2000
144 exam-style questions on CIE IGCSE Physics 5.2.4a Half-life. Each one has a worked solution and a mark scheme showing where the marks go.