A sample of a radioactive substance may decay by the emission of either α-radiation or β-radiation and/or γ-radiation. State the type of radiation, one in each case, that:

1. (a)consists of leptons ......................................................................................................................................... [1][1]
2. (b)contains quarks ......................................................................................................................................... [1][1]
3. (c)cannot be deflected by an electric field ......................................................................................................................................... [1][1]
4. (d)has a continuous range of energies, rather than discrete values of energy. ......................................................................................................................................... [1][1]