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View submission: Ask Anything Wednesday - Engineering, Mathematics, Computer Science
Pretty much all waves act like this, but the lower the frequency (aka the longer the wavelength) the easier it is to line them up in that manner. If you look up "destructive interference of _____ waves" and plug in light, radio, whatever you'll see plenty of examples. Probably not for magnets since that's a force not a wave, but who knows.
One thing to keep in mind is that destructive interference is just the opposite of constructive interference, except constructive is, IMO, more useful. Lasers, microwaves, etc. all rely on constructive interference to amplify a single wavelength for a specific purpose. Destructive is planned around - for example see the positioning of radio towers.
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