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.

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Presentation transcript:

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?

WavesSection 2 Wave Properties What are some ways to measure and compare waves?

WavesSection Wave Properties, continued amplitude: the maximum distance in meters that the particles of a wave’s medium vibrate from their rest position

WavesSection Wave Properties, continued for a transverse wave, measured from the rest position to the crest or the trough

WavesSection Wave Properties, continued Wavelength (  : the distance in meters from any point on a wave to an identical point on the next wave

WavesSection Wave Properties, continued The greater the amplitude, the greater the energy in a wave.

WavesSection Wave Properties, continued The greater the wavelength, the less the energy in a wave.

WavesSection Wave Properties, continued period (T ): in physics, the time in seconds that it takes a complete cycle or wave oscillation to occur

WavesSection 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

WavesSection 2 Wave Speed How can you calculate the speed of a wave?

WavesSection Wave Speed The speed of a wave is equal to wavelength divided by period, or frequency multiplied by wavelength.

WavesSection Wave Speed, continued In general, wave speed is greatest in solids and least in gases.

WavesSection Wave Speed, continued In a given medium, the speed of waves is constant.

WavesSection Wave Speed, continued the speed of light (c) in a vaccum = 3.00  10 8 m/s c = f 

WavesSection 2 The Doppler Effect Why does the pitch of an ambulance siren change as the ambulance rushes past you?

WavesSection The Doppler Effect, continued Doppler effect: an observed change in the frequency of any type of wave when the source or observer is moving

WavesSection 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.