Cobalt-60 is a radioactive isotope that emits beta (β\betaβ) particles.
The nuclide notation for cobalt-60 is 2760Co^{60}_{27}\text{Co}2760Co.
State the number of protons in one nucleus of cobalt-60.
Determine the number of neutrons in one nucleus of cobalt-60.
A sample containing 80 mg80\text{ mg}80 mg of cobalt-60 decays to 5.0 mg5.0\text{ mg}5.0 mg in 21.2 years21.2\text{ years}21.2 years.
Calculate the half-life of cobalt-60.
Cosmic rays are one source of background radiation.
Name two other sources that make a significant contribution to background radiation.
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.