A light source and a detector are separated by a vacuum. The detector receives energy when the source is switched on.
Which statement explains this observation?
The light carries particles of air from the source.
The light produces a current through the vacuum.
The light requires particles in the space to vibrate.
The light transfers energy across the empty space.
84 exam-style questions on Edexcel GCSE Physics 5.2 The electromagnetic spectrum, covering 5.2.1 Electromagnetic waves and refraction in glass (core practical), 5.2.2 Groups of the electromagnetic spectrum, 5.2.3 Wavelength-dependent behaviour of EM waves, and 5.2.4 Velocities of EM waves in different substances. Each one has a worked solution and a mark scheme showing where the marks go.