All forms of electromagnetic radiation, whether they're called waves or rays, are generated by particles in motion. In a radio signal, for example, negatively charged electrons quickly move back ...

Speaker one We’re going to investigate emissions of infrared radiation first and then absorption by completing two short experiments. We’re going to use a Leslie cube to investigate emissions.

Remember to look at your lab book or your notes from the practical activities you have done when you're revising for the ... are measuring the image of the wave, rather than the wave itself.