Radio and TV waves

These are the longest wavelength, lowest frequency part of the electromagnetic spectrum family.

See here for an interactive Java program - showing how aerials detect radio signals

For GCSE
When radiowaves are absorbed by an aerial the electrons in the aerial vibrate at the same frequency as the radiowaves. This gives rise to an alternating voltage (current) - that is all they expect you to know at this level.

Here is a viclip of a 1948 film that shows how a TV camera works. Although today's cameras work with more sophisticated electronics the basic process is the same.