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Unformatted text preview: or leads the other: Phase • What happens when we combine more than one wave? The principle of superposition says we just add the amplitudes directly to find the resultant wave. Superposition • What happens when the phase of one wave is different from the other? The result is another sine wave: Superposition • When waves are completely out of phase (that is they differ by 180 or π radians), they may completely cancel! Superposition • When waves add to produce a larger amplitude, we say that the waves constructively interfere . • When waves cancel one another out, we say that the waves destructively interfere . • Adding two waves of differing frequencies can produce beats . The beat frequency is the difference between the two frequencies of the waves being added. Superposition f beat = f 2f 1 Beats Beats • This is how you tune an instrument. You count beats. Superposition f beat = f 2f 1...
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 Summer '08
 Niculescu,M
 Frequency

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