Sine waves can be represented mathematically and it can be shown that any wave can be constructed from an appropriate combination of sine waves (Fourier Series).
Animated diagrams of two superposing transverse waves and their resultant. Wavelength, phase and amplitude are adjustable. Uses the word "interference" instead of "superposition".
A basic explanation of sound and water waves. The JAVA Applet allows you to change the amplitude of the wave (its height), the wavelength (the distance from one wave top, or crest, to the next) and the phase (how far to the left or right the wave slides).
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