Electromagnetic waves transfer energy from a source to an observer.
Explain how infrared from the Sun warms a person's skin, even though there is a vacuum between the Sun and the Earth.
Light from the Sun takes 500 s to reach the Earth. The speed of light in a vacuum is 3.0 × 108 m/s.
Calculate the distance between the Sun and the Earth.
A person sees a lamp in a room.
Describe how energy is transferred from the lamp to the person.
A student says:
'Electromagnetic waves transfer energy, so they must also carry matter from the source to the observer.'
Explain why the student is wrong.
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.