1. Carbon-14 is radioactive. Its nucleus emits beta radiation.

     Which two of the following materials would you expect the beta radiation to pass through?

     Few centimetres of air / Few centimetres of lead / Few centimetres of aluminium / A sheet of paper.

 2. Radon-220 is radioactive. Its nucleus emits alpha radiation.

     Which of the following materials would you expect the alpha radiation to pass through?

     Few centimetres of lead / Few centimetres of aluminium / A sheet of paper / The skin.

 3. Complete the following table.