A receiving circuit has electrical oscillations at 75 MHz. The transmitter is adjusted so that its oscillation frequency becomes 100 MHz. The receiver detects the new signal. Which statement describes the change?
The radio-wave frequency and induced frequency both increase by one third.
The radio-wave frequency and induced frequency both increase by one quarter.
The radio-wave frequency increases by one third; the induced frequency is unchanged.
The radio-wave frequency increases by one quarter; the induced frequency is unchanged.
104 exam-style questions on Edexcel GCSE Physics 5.4 Uses and dangers of EM radiation, covering 5.4.1 Dangers of electromagnetic radiation, 5.4.2 Uses of electromagnetic radiation, 5.4.3 Radio waves and oscillations in circuits, and 5.4.4 Changes in atoms and nuclei generating radiation. Each one has a worked solution and a mark scheme showing where the marks go.