A radioactive source is placed 15 mm in front of a detector.
The count rate from the source is 3000 counts/minute3000\text{ counts/minute}3000 counts/minute.
With a thin sheet of paper between the source and the detector, the count rate is 1800 counts/minute1800\text{ counts/minute}1800 counts/minute.
With a sheet of aluminium 5 mm thick between the source and the detector, the count rate is 0 counts/minute0\text{ counts/minute}0 counts/minute.
Which radioactive emissions are coming from the source?
alpha, beta and gamma
alpha and beta only
beta and gamma only
alpha and gamma only
134 exam-style questions on CIE IGCSE Physics 5.2.2a Alpha, beta and gamma emission. Each one has a worked solution and a mark scheme showing where the marks go.