L4_27.pptx - Topics for Today Doppler effect(17-7...

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Topics for Today Doppler effect (17-7) Supersonic speeds, shock waves (17-8) Temperature (18-1) Celsius, Kelvin, and Fahrenheit (18-2)
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Do demo 3B40.10 - Doppler Effect - Buzzer and String Sound waves from a stationary source expand out equally in all directions. Doppler Effect If the source is moving, then the waves moving in the same direction get bunched together. Waves moving in the opposite direction get spread out. Observed frequency is where f = source frequency, v = speed of sound, v d = speed of detector, v s = speed of source To get the +/- signs right, remember that moving towards each other increases frequency.
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Doppler Effect Detector is stationary. Waves with wavelength, λ, move past at speed, v . Number of waves in time, t , is . Frequency of waves passing detector Detector moves towards source with speed . Waves move past at relative speed . Number of waves in time, t , is . Frequency of waves passing detector
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A child is swinging back and forth with a constant period and amplitude. Somewhere in front of the child, a stationary horn is emitting a constant tone of frequency f S . Five points are labeled in the drawing to indicate positions along the arc as the child swings.
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