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They do not depend on an external medium—unlike a mechanical wave such as a sound wave which must travel through air, water, or some solid medium. Electromagnetic waves cover a huge range of frequencies, from high-frequency gamma rays and x-rays, to ultraviolet light, visible light, and infrared light, and on into microwaves and radio waves. Sound - . unit 8. what is sound?. how do we perceive sound?. sound. sound is a longitudinal wave. we most commonly. In this case, all you need to do is to arrange the acoustic panels in the space you require and then move them away when you no longer need them.