You need to know about these quantities used in waves - what they mean, the symbols used for them and the units used to measure them. The amplitude (\(a\)) of a wave is the distance from the centre ...

Electromagnetic radiation is a form of energy that includes radio waves, microwaves, X-rays and gamma rays, as well as visible light. When you purchase through links on our site, we may earn an ...

Sophie is admiring Chris from afar when her phone application Ada suggests ways of communicating with Chris and attracting his attention. Through comparing gossip travelling around a school to sound ...