There are four kinds of waves that have a greater wavelength than those that we can see, longer than red light: radio TV waves, microwaves, infrared, and ultraviolet. This is due to how wavelength dictates the frequency of a wave. Frequency is simply how many waves can pass by something in a certain amount of time - say a second. The longer the wavelength is, the longer it takes for the wave to pass something. If the wavelength is shorter, it takes less time to get through something. The same kind of science applies to soundwaves, and will better illustrate the point.
When you hear a high-pitched noise, it has a short wavelength. It takes less time to hit your ears, and it hits it fast. The lower the sound, the longer the wave is.
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