A soil-monitoring sensor sends data using a radio transmitter. The transmitting circuit completes 1.2 × 107 electrical oscillations in 0.080 s.
Radio waves travel at 3.0×108 m s−13.0\times10^8\ \mathrm{m\,s^{-1}}3.0×108 ms−1.
What is the wavelength of the radio waves produced by the transmitter?
Use v=fλv=f\lambdav=fλ.
5.0×10−1 m5.0\times10^{-1}\ \mathrm{m}5.0×10−1 m
3.1×102 m3.1\times10^2\ \mathrm{m}3.1×102 m
2.0 m2.0\ \mathrm{m}2.0 m
1.5×108 m1.5\times10^8\ \mathrm{m}1.5×108 m
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.