A stadium uses a wireless timing system. A timing unit contains a source circuit and a display contains a receiving circuit. The circuits are separated by air and are not connected by a wire. A technician operates the timing unit at two settings and measures the frequency of the charge oscillations in the source circuit and the frequency of the electrical response in the receiving circuit.
| Setting | Frequency of charge oscillations in source circuit | Frequency of electrical response in receiving circuit |
|---|---|---|
| P | 700 kHz | 700 kHz |
| Q | 1.4 MHz | 1.4 MHz |
The technician claims that the frequency of the electrical response is fixed by the receiving circuit and is not affected by the source setting.
Evaluate the technician's claim using the results and your knowledge of how the signal travels from the timing unit to the display.
93 exam-style questions on AQA GCSE Physics 6.2 Electromagnetic waves, covering 6.2.1 Types of electromagnetic waves, 6.2.2 Properties of electromagnetic waves 1, 6.2.3 Properties of electromagnetic waves 2, 6.2.4 Uses and applications of electromagnetic waves, 6.2.5 Lenses, and 6.2.6 Visible light. Each one has a worked solution and a mark scheme showing where the marks go.