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WavesSection 2 Bellringer In the diagram, A is the distance from a point on one wave to an identical point on the next wave. What might this distance be called? 1.In the diagram, B is the amplitude of a wave. What do you think this is a measure of? 2.Twenty waves pass by a point in a certain amount of time. Would this be a measure of a wave’s speed or frequency?
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WavesSection 2 Wave Properties What are some ways to measure and compare waves?
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WavesSection 2 15-2-1 Wave Properties, continued amplitude: the maximum distance in meters that the particles of a wave’s medium vibrate from their rest position
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WavesSection 2 15-2-2 Wave Properties, continued for a transverse wave, measured from the rest position to the crest or the trough
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WavesSection 2 15-2-3 Wave Properties, continued Wavelength ( : the distance in meters from any point on a wave to an identical point on the next wave
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WavesSection 2 15-2-4 Wave Properties, continued The greater the amplitude, the greater the energy in a wave.
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WavesSection 2 15-2-5 Wave Properties, continued The greater the wavelength, the less the energy in a wave.
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WavesSection 2 15-2-6 Wave Properties, continued period (T ): in physics, the time in seconds that it takes a complete cycle or wave oscillation to occur
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WavesSection 2 15-2-7 Wave Properties, continued –Frequency (f): the number of cycles or vibrations per unit of time expressed in hertz (Hz); also the number of waves produced in a given amount of time
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WavesSection 2 Wave Speed How can you calculate the speed of a wave?
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WavesSection 2 15-2-9 Wave Speed The speed of a wave is equal to wavelength divided by period, or frequency multiplied by wavelength.
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WavesSection 2 15-2-13 Wave Speed, continued In general, wave speed is greatest in solids and least in gases.
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WavesSection 2 15-2-14 Wave Speed, continued In a given medium, the speed of waves is constant.
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WavesSection 2 15-2-15 Wave Speed, continued the speed of light (c) in a vaccum = 3.00 10 8 m/s c = f
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WavesSection 2 The Doppler Effect Why does the pitch of an ambulance siren change as the ambulance rushes past you?
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WavesSection 2 15-2-16 The Doppler Effect, continued Doppler effect: an observed change in the frequency of any type of wave when the source or observer is moving
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WavesSection 2 15-2-17 The Doppler Effect, continued The frequency of sound waves from a source moving toward an observer is higher than if the observer was moving with the source and lower when the source is moving away.
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