Games and Tools
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Make any frequency or amplitude traveling wave on a string, and even play around with damping. Better than jumping rope, but you might burn fewer calories.
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But educate yourselves on how waves interfere with each other—light, sound, and ripples.
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How microwaves heat food and drink.
Videos
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Plane traveling at supersonic speeds will often cause moisture to condense around them in wedge-shaped contrails that precede sonic booms, leaving the traditional Doppler Effect far behind.
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Some of the people most in tune with wave interference are concert hall architects—who must make sure the performers sound phenomenal from every single seat.
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Most waves we've talked about have small amplitudes, but they do get bigger. Much bigger.
Websites
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If you've ever wondered where Superman's heat vision falls on the spectrum of electromagnetic waves, well, Randall Munroe's got you covered.
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Another wave propagation comparison from xkcd—when does Twitter let you know about an earthquake before the earthquake itself?
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How seismic waves fit into our transverse/longitudinal discussion.
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This unmanned robot uses two very different kinds of waves for power—sunlight and ocean swells.