Two aerials are separated by a vacuum. An oscillating current in aerial P produces a signal detected by aerial Q. A student says that electrons must travel across the vacuum from P to Q. Which statement correctly explains the observation?
Sound waves transfer energy; electrons oscillate locally in each aerial.
Radio waves transfer electrons; energy remains stored in aerial P.
Radio waves transfer energy; electrons oscillate locally in each aerial.
Sound waves transfer electrons; energy remains stored in aerial P.
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.