1.1. Rutherford used the scattering of α-particles to provide evidence for the structure of the atom.

The apparatus includes an α-particle source fired at a gold foil inside a vacuum chamber.

Which two of the following are reasons why there must be a vacuum in the chamber?

Tick (✓) two boxes.   

1.2. The equipment Rutherford used is shown in Figure 1.

Figure 1

Label the diagram using words or phrases from the box below. Each answer should be used once.

1.3. Figure 2 shows  particles incident on a layer of atoms in a gold foil.

Figure 2

Match each of the numbers 1-4 with the statements below:

1.4. Following Rutherford's experiment, Niels Bohr came up with a modified model.

Complete the sentences about Bohr's model. 

Choose answers from the box. 

Each answer should be used once.

Electrons orbit the .................... at different distances.

The different orbit distances are called .................... .

The further away from the nucleus the .................... the energy.