CAPE Physics Unit 1 · 2007 (Specimen) · Paper 1 · Question Q27

Item 27 refers to the following diagram. A microwave transmitter X sends radio waves to a metal sheet Y. A probe, P, between X and Y is moved from one node through 20 antinodes to a node 0.3\text{ m} away. What is the frequency of the microwaves emitted from X?

1. (A)3 \times 10^{-2}\text{ Hz}
2. (B)3 \times 10^{-8}\text{ Hz}
3. (C)2 \times 10^{10}\text{ Hz}
4. (D)1 \times 10^{10}\text{ Hz}

This question uses a figure or table from the paper — you'll see it when you practise.