e) none of t! 9. Two complex wave forms showing pressure versus time, each representing a sound, are shown in Figure 6- 13 Which of the following is true? a) The two sounds have differing pitches. b) The two sounds have the same loudness. c) The two sounds have different sound quality. d) The two ounds are identical to the ear. e) Answers a and c are both correct. 10. Apiano tuner uses beats between the note anda tuning fork to tune a piano key. His tuning fork oscillates at 256 Hz, and he hears 3 beats per second. What is the frequency of the piano note? a) 3 Hz b) 259 Hz c) 253 Hz d) either 253 or 259 Hz e) none of these iollowing would definitely not affect the repeat time of a complex wave on a

e) none of t! 9. Two complex wave forms showing pressure versus time, each representing a sound, are shown in Figure 6- 13 Which of the following is true? a) The two sounds have differing pitches. b) The two sounds have the same loudness. c) The two sounds have different sound quality. d) The two ounds are identical to the ear. e) Answers a and c are both correct. 10. Apiano tuner uses beats between the note anda tuning fork to tune a piano key. His tuning fork oscillates at 256 Hz, and he hears 3 beats per second. What is the frequency of the piano note? a) 3 Hz b) 259 Hz c) 253 Hz d) either 253 or 259 Hz e) none of these iollowing would definitely not affect the repeat time of a complex wave on a

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter14: Sound

Section: Chapter Questions

Problem 17P: The toadfish makes use of resonance in a closed tube to produce very loud sounds. The tube is its...

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Two cars are on the same straight road. Car A moves east at 55 mph and sounds its horn at 625 Hz. Rank from highest to lowest the frequency observed by Car Bs driver in each of these cases: Car B is moving east at 70 mph and is (a) behind and (b) in front of Car A. Car B is moving west at 70 mph and is (c) behind and (d) in front of Car A.
When sound passes from one medium to another where its propagation speed is different, does its frequency or wavelength change? Explain your answer briefly.
With a sensitive sound-level meter, you measure the sound of a running spider as -10 dB. What does the negative sign imply? (a) The spider is moving away from you. (b) The frequency of the sound is too low to be audible to humans. (c) The intensity of the sound is too faint to be audible to humans. (d) You have made a mistake; negative signs do not fit with logarithms.
What are the closest frequencies to 500 Hz that an average person can clearly distinguish as being different in frequency from 500 Hz? The sounds are not present simultaneously.
The toadfish makes use of resonance in a closed tube to produce very loud sounds. The tube is its swim bladder, used as an amplifier. The sound level of this creature has been measured as high as 100. dB. (a) Calculate the intensity of the sound wave emitted. (b) What is the intensity level if three of these toadfish try to make a sound at the same time?
Which of the following statements is not necessarily true regarding mechanical waves? (a) They are formed by some source of disturbance. (b) They are sinusoidal in nature. (c) They carry energy. (d) They require a medium through which to propagate. (e) The wave speed depends on the properties of the medium in which they travel.
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How do sound vibrations of atoms differ from thermal motion?
A certain uniform string is held under constant tension. (a) Draw a side-view snapshot of a sinusoidal wave on a siring as shown in diagrams in the text. (b) Immediately below diagram (a), draw the same wave at a moment later by one-quarter of the period of the wave. (c) Then, draw a wave with an amplitude 1.5 times larger than the wave in diagram (a). (d) Next, draw a wave differing from the one in your diagram (a) just by having a wavelength 1.5 times larger. (e) Finally, draw a wave differing from that in diagram (a) just by having a frequency 1.5 times larger.
A flute plays a note with a frequency of 600 Hz. The flute can be modeled as a pipe open at both ends, where the flute player changes the length with his finger positions. What is the length of the tube if this is the fundamental frequency?
What is the ratio of intensi?es of two sounds of identical frequency if the first is just barely discernible as louder to a person than the second?
You are driving toward the base of a cliff and you honk your horn. (a) Is there a Doppler shift of the sound when you hear the echo? If so, is it like a moving source or moving observer? (b) What if the reflection occurs not from a cliff, but from the forward edge of a huge alien spacecraft moving toward you as you drive?