# 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
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
“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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