Physics · May / June 2019 · Paper 12 · Question 13

A length of metal wire is made from a radioactive isotope of the metal. The diagram shows masses suspended from the end of the wire. [diagram: wire suspended from a support with masses hanging from its lower end] The masses are removed from the wire. Which property changes?

1. Ahalf-life of the isotope
2. Blength of the wire
3. Cmass of the wire
4. Dmelting point of the metal

As printed in the paper