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Published byJasmin Stafford Modified over 9 years ago
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What happens when two wave pulses collide?
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Interference – Two waves “collide,” but pass through each other undamaged – Superposition Principle: when waves interfere with each other, the resulting wave is the sum of their amplitude at each point.
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Destructive Interference
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Constructive Interference
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crests aligned with crests waves are “out of phase”
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Destructive Interference crests aligned with troughs waves are “out of phase”
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Interference – Add the amplitudes of the waves Above axis is positive, below is negative – The result is the superposition of the waves – Constructive wave gets bigger – Destructive wave gets smaller
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What if we send a bunch of pulses down the spring and let them reflect back? How will they interfere with one another?
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Standing waves Animation
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Parts of a Wave 246 x(m) 3 -3 y(m) Crest/antinode Trough/antinode node
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Wave Parameters 3 -3 246 x(m) y(m) amplitude wavelength
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You can make a standing wave on a spring. – Figure out how to make different standing waves. – What would a graph of wavelength vs. # of antinodes look like? – Collect the data to make this graph. Wavelength # of antinodes
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