PH20Unit4Assignment4

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Bow Valley College, Calgary *

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Physics

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Jan 9, 2024

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Physics 20 Unit 4 Lesson 4 Resonance and the Doppler Effect Total /23 ____ 1. When the source of a sound wave is moving toward an observer, which of the following will appear to occur? a . The apparent wavelength of the sound is less than the true wavelength of the sound. b . The apparent wavelength of the sound is greater than the true wavelength of the sound. c . The apparent speed of the wave is greater than the true speed of the wave. d . The apparent speed of the wave is less than the true speed of the wave. /1 Doppler Waves When a wave source is in motion, the wavelengths in front of and behind the source are altered. (This diagram is not to scale.)
____ 2. Refer to the diagram Doppler Waves to answer this question. The diagram shows the wave fronts created by a sound source moving to the right. The waves that precede the source have a wavelength ( ) of 1.22 m, while those that trail the source have a wavelength ( ) of 1.46 m. If the speed of sound in air is 336 m/s, what is the true frequency of the source? a . 251 Hz c . 230 Hz b . 275 Hz d . 249 Hz /1 ____ 3. What is the observed frequency of a siren on a police car that is moving away from you at a speed of 36.7 m/s if the frequency heard inside the car is 415 Hz? The speed of sound is 335 m/s. a . 374 Hz c . 389 Hz b . 382 Hz d . 396 Hz /1 4. What causes the Doppler effect? When a source generating waves moves relative to an observer, or when an observer moves relative to a source, there is an apparent shift in frequency /2 5. While driving her car toward the town’s fire station at 45 km/h, a volunteer paramedic hears the station’s siren. If the frequency of the sound emitted by the siren is 545 Hz and the speed of sound is 340 m/s, find the frequency at which the paramedic hears the sound. v=45 km/h = 12.5 m/s Fsource=545 Hz vs=340 m/s Flistener=? Fsource( 340 + 12.5)/340 =565 Hz =5.7*10Hz /3 ____ 6. A wave in a spring, stretched to a length of 5.30 m, travels at a speed of 3.40 m/s. What is the lowest resonant frequency for this spring? a . 0.160 Hz c . 0.642 Hz
b . 0.321 Hz d . 1.14 Hz /1 ____ 7. If you blow across the top of an empty bottle to create a sound with a wavelength , what is the length of cavity inside the bottle in terms of the wavelength of the sound? a . c . b . d . /1 8. The pitch of the sound produced by a vibrating string depends on its frequency /1 Use this information to answer the next 2 questions. The diagram shows a tuning fork vibrating over an air column closed at one end by water. The length of the air column can be varied and is one quarter of the wavelength of the longest standing waves set up by the tuning fork. 9. If the speed of sound in air is 343 m/s and the frequency of the tuning fork is 225 Hz, what is the length of the air column shown in the diagram? v=343 m/s F= 225 Hz v= *f 343 = *225
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