Longitudinal waves Transverse waves Not really waves at all Highly charged waves
Can be used to cook food Can be reflected from the ionosphere Are usually blue to look at Are used by remote controls to change a TV channel
Radio waves Microwaves Ultraviolet rays Gamma rays
Putrescent Phosphorescent Fluorescent Indecent
Radio is used to make people grow faster Radio is used to make people feel better Radio is used to make people see better Gamma rays are used to treat cancer
Is stronger than an analogue signal Is weaker than an analogue signal Has less noise than an analogue signal Has more noise than an analogue signal
Be decoded Be blended Be treated with preservative Not be allowed to travel through air