A 520 Hz whistle is moved toward a listener at a speed of 20 m/s. At the same time, the listener moves at a speed of 45 m/s in a direction away from the whistle. What is the apparent frequency heard by the listener? (The speed of sound is 340 m/s)
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- The Doppler effect is a change in the observed frequency of a wave (such as a sound wave or light wave) when the source of the wave and observer are in motion relative to each other. The Doppler effect explains why an observer hears a change in pitch of an ambulance siren as the ambulance passes by the observer. The frequency F(v) of a sound relative to So an observer is given by F(v) = fal , where fa is the actual frequency of the sound at the source, so is the speed of sound in air (772.4 mph), and v is the speed at which the source of sound is moving toward the observer. Use this relationship for Exercise. Suppose that an ambulance moves toward an observer. a. Write F as a function of v if the actual frequency of sound emitted by the ambulance is 560 Hz. b. Use a graphing utility to graph the function from part (a) on the window [0, 1000, 100] by [0, 5000, 1000]. C. As the speed of the ambulance increases, what is the effect of the frequency of sound?Ultrasound reflected from an oncoming bloodstream that is moving at 33.0 cm/s is mixed with the original frequency of 1.50 MHz to produce beats. What is the beat frequency (in Hz)?A sound source with a frequency of 725 Hz moves away from a stationary observer at a rate of 15m/s. What frequency does the observer hear?
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- A bystander hears a siren vary in frequency from 590 Hz to 368 Hz as a fire truck approaches, passes by, and moves away on a straight street. What is the speed of the truck? (Take the speed of sound in air to be 343 m/s.)A guitar string produces a musical note with a wavelength of 78.0 cm. If the speed of the sound in air is 347 m/s, what is the frequency of the note? * 445 Hz 0.29 Hz 290 Hz O 4.4 Hz O 29 kHzThe speed of sound in a certain monatomic gas is 320 m/s at room temperature (20℃). What gas is this?
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