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L4_18.pptx - Topics for Today Third exam is Wednesday April...

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Topics for Today Third exam is Wednesday, April 20 Third exam will cover chapters 11-15. Energy and power of a wave on a string (16-3) Interference of wave (16-5) Standing waves and resonance (16-7) Will not do wave equation (16-4) or phasors (16-6)
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A wave is described by the equation y = 0.020 sin (3.0x - 6.0t), where the distances are in meters and time is measured in seconds. What is the speed of this wave? A) 0.50 m/s B) 1.0 m/s C) 2.0 m/s D) 0.020 m/s Wave Speed
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Waves transmit energy If you send a continual stream of sinusoidal waves down a string, the average rate at which energy is transmitted = average power is More power for more mass, speed, frequency, or amplitude. Power of a wave traveling on a string
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Demo of interference. When two waves pass through the same region of space, we simply add their amplitudes: When the wave pulse move past each other, they come through unchanged. Wave Interference
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“Constructive” interference is when the final amplitude is greater than the individual amplitudes. “Destructive” interference is when the final amplitude is greater than the individual amplitudes.
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