Transmitter P completes 1.8 × 106 electrical oscillations in 0.020 s. Transmitter Q operates at 60 MHz. A receiving aerial detects each signal separately. Which statement gives the frequencies induced in the receiver and identifies the higher one?
P induces 36 MHz36\ \mathrm{MHz}36 MHz and Q induces 60 MHz60\ \mathrm{MHz}60 MHz; P is higher.
P induces 90 MHz90\ \mathrm{MHz}90 MHz and Q induces 60 MHz60\ \mathrm{MHz}60 MHz; Q is higher.
P induces 90 MHz90\ \mathrm{MHz}90 MHz and Q induces 60 MHz60\ \mathrm{MHz}60 MHz; P is higher.
P induces 36 MHz36\ \mathrm{MHz}36 MHz and Q induces 60 MHz60\ \mathrm{MHz}60 MHz; Q is higher.
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.