A sample contains 600 mg of a radioactive isotope. The half-life of the isotope is 8 days8\text{ days}8 days. What mass of this radioactive isotope remains after 24 days24\text{ days}24 days?
0 mg0\text{ mg}0 mg
75 mg75\text{ mg}75 mg
150 mg150\text{ mg}150 mg
300 mg300\text{ mg}300 mg
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.