Observe: Using the Gizmo, try to determine how each factor (fsource, vsource, and vsound)Īffects the observed Doppler shift.Question: What factors affect the magnitude of the Doppler shift? Summarize: Based on what you have learned, how will the sound that the observer hears change as the airplane passes by? Explain your answer. Is the frequency of sound waves behind the plane? _ Click Play, and then click Pause just after the plane has passed the observer. What is the frequency of sound waves in front of the plane? _ī. Click Play, and then click Pause when the sound wavesĪ. (The car is now an airplane.) At upper right, turn on theĭrag the observer onto the road. Sound waves that are spaced far apart will produce a lower, deeper pitch. Now decrease the frequency by moving the fsource slider all the way to the left. When the wavelength of the waves is short, the sound will be high in pitch.ī. How does this affect the spacing of the waves? _ Increase the frequency of the sound waves by moving the fsource slider to the right. Moving away from the car in all directions.Ī. Observe: With the car’s velocity (vsource) set to 0 m/s, click Play. The greater the number of sound waves passing by a point each second is, thehigher the frequency and the pitch will be. Introduction: The pitch of a sound, or how shrill or deep it is, is related to the frequency of the To 340 m/s, close to the actual speed of sound. Check that fsource is set to 500 Hz and vsound is set Why do you think the waves in front of the car have a shorter wavelength than the wavesīehind the car? _ Wavelength in front of car: _ Wavelength behind car: _ (Note: The red circles represent every thousandth wave.) Use the Ruler to measure the wavelength, or the distance between the lines, of the waves ) and compare the sound waves in front of and behind the car. What do you hear? _Ĭlick Play ( ) and observe the sound waves emitted from the moving car. Gizmo’s sound and your computer’s speakers are on.) The Gizmo shows a vehicle that emits Doppler Shift Gizmo illustrates why the Doppler shift sound wavesĪnd an observer who will hear the sounds.Ĭlick the PLAY SAMPLE button ( ). The change in the sound that you hear is called the Doppler shift. Have you ever heard a siren on a moving ambulance, fire truck, or police car? If so, whathappens to the sound as the vehicle passes by? Vocabulary: Doppler shift, frequency, pitch, sonic boom, sound waves, wavelength Prior Knowledge Questions (Do these BEFORE using the Gizmo.) Name: _ Date: _ Student Exploration: Doppler Shift
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