EP PHYSICS F/SCI.+ENG.W/MOD..-MOD.MAST.
5th Edition
ISBN: 9780134402635
Author: GIANCOLI
Publisher: PEARSON CO
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(III) Two loudspeakers are placed 3.00 m apart, as shown in
Fig. 12–37. They emit 474-Hz sounds, in phase. A micro-
phone is placed 3.20 m distant from a point midway between
the two speakers, where an intensity maximum is recorded.
(a) How far must the microphone be moved to the right
to find the first intensity
minimum? (b) Suppose the
speakers are reconnected so
that the 474-Hz sounds they
emit are exactly out of
phase. At what positions are
the intensity maximum and
minimum now?
H3.00 m-
3.20 m
dɔ
FIGURE 12-37
Problem 54.
(III) Two loudspeakers are placed 3.00 m apart, as shown in
Fig. 12–37. They emit 474-Hz sounds, in phase. A micro-
phone is placed 3.20 m distant from a point midway between
the two speakers, where an intensity maximum is recorded.
(a) How far must the microphone be moved to the right|
to find the first intensity
minimum? (b) Suppose the
speakers are reconnected so
that the 474-Hz sounds they
emit are exactly out of
phase. At what positions are
the intensity maximum and
minimum now?
H3.00 m -
3.20 m
d2
FIGURE 12-37
Problem 54.
(a) (i) State what is meant by the specific acoustic impedance of a medium.
(ii) The density of a sample of bone is 1.8 gcm 3 and the speed of ultrasound in the bone is
4.1 x 10°ms-1.
Calculate the specific acoustic impedance Z, of the sample of bone.
Z3 =
kgm-2s-1
Chapter 16 Solutions
EP PHYSICS F/SCI.+ENG.W/MOD..-MOD.MAST.
Ch. 16.3 - If an increase of 3 dB means twice as intense,...Ch. 16.3 - Trumpet players. A trumpeter plays at a sound...Ch. 16.4 - Prob. 1CECh. 16.4 - Prob. 1EECh. 16.7 - Prob. 1FECh. 16.7 - How fast would a source have to approach an...Ch. 16 - What is the evidence that sound travels as a wave?Ch. 16 - What is the evidence that sound is a form of...Ch. 16 - Children sometimes play with a homemade telephone...Ch. 16 - When a sound wave passes from air into water, do...
Ch. 16 - What evidence can you give that the speed of sound...Ch. 16 - The voice of a person who has inhaled helium...Ch. 16 - Two tuning forks oscillate with the same...Ch. 16 - How will the air temperature in a room affect the...Ch. 16 - Explain how a lube might be used as a filler to...Ch. 16 - Prob. 10QCh. 16 - Prob. 11QCh. 16 - A noisy truck approaches you from behind a...Ch. 16 - Traditional methods of protecting the hearing of...Ch. 16 - In Fig. 16-15, if the frequency of the speakers is...Ch. 16 - Prob. 15QCh. 16 - Consider the two waves shown in Fig. 1630. Each...Ch. 16 - Is there a Doppler shift if the source and...Ch. 16 - If a wind is blowing, will this alter the...Ch. 16 - Figure 1631 shows various positions of a child on...Ch. 16 - Prob. 1MCQCh. 16 - Prob. 2MCQCh. 16 - Prob. 3MCQCh. 16 - Prob. 4MCQCh. 16 - Prob. 5MCQCh. 16 - Prob. 6MCQCh. 16 - Prob. 7MCQCh. 16 - Prob. 8MCQCh. 16 - Prob. 9MCQCh. 16 - Prob. 10MCQCh. 16 - Prob. 11MCQCh. 16 - Prob. 12MCQCh. 16 - Prob. 13MCQCh. 16 - Prob. 14MCQCh. 16 - Prob. 1PCh. 16 - Prob. 2PCh. 16 - Prob. 3PCh. 16 - Prob. 4PCh. 16 - Prob. 5PCh. 16 - Prob. 6PCh. 16 - Prob. 7PCh. 16 - Prob. 8PCh. 16 - (II) Write an expression that describes the...Ch. 16 - Prob. 10PCh. 16 - Prob. 11PCh. 16 - Prob. 12PCh. 16 - Prob. 13PCh. 16 - What is the intensity of a sound at the pain level...Ch. 16 - Prob. 15PCh. 16 - Prob. 16PCh. 16 - Prob. 17PCh. 16 - Prob. 18PCh. 16 - A fireworks shell explodes 100m above the ground,...Ch. 16 - Prob. 20PCh. 16 - Prob. 21PCh. 16 - Prob. 22PCh. 16 - Prob. 23PCh. 16 - Prob. 24PCh. 16 - Prob. 25PCh. 16 - Prob. 26PCh. 16 - Prob. 27PCh. 16 - Prob. 28PCh. 16 - Prob. 29PCh. 16 - Prob. 30PCh. 16 - Prob. 31PCh. 16 - Prob. 32PCh. 16 - Prob. 33PCh. 16 - Prob. 34PCh. 16 - Prob. 35PCh. 16 - Prob. 36PCh. 16 - Prob. 37PCh. 16 - (II) A particular organ pipe can resonate at 264...Ch. 16 - Prob. 39PCh. 16 - Prob. 40PCh. 16 - Prob. 41PCh. 16 - Prob. 42PCh. 16 - Prob. 43PCh. 16 - The human car canal is approximately 2.5 cm long....Ch. 16 - Prob. 45PCh. 16 - (II) Approximately what are the intensities of the...Ch. 16 - Prob. 47PCh. 16 - Prob. 48PCh. 16 - Prob. 49PCh. 16 - What is the beat frequency if middle C (262 Hz)...Ch. 16 - Prob. 51PCh. 16 - (II) The two sources of sound in Fig. 1615 face...Ch. 16 - Prob. 53PCh. 16 - Prob. 54PCh. 16 - Prob. 55PCh. 16 - Prob. 56PCh. 16 - Prob. 57PCh. 16 - Prob. 58PCh. 16 - Prob. 59PCh. 16 - Prob. 60PCh. 16 - Prob. 61PCh. 16 - Prob. 62PCh. 16 - Prob. 63PCh. 16 - Prob. 64PCh. 16 - Prob. 65PCh. 16 - Prob. 66PCh. 16 - Prob. 67PCh. 16 - Prob. 68PCh. 16 - Prob. 69PCh. 16 - Prob. 70PCh. 16 - Show that the angle a sonic boom makes with the...Ch. 16 - Prob. 72PCh. 16 - Prob. 73GPCh. 16 - Prob. 74GPCh. 16 - Prob. 75GPCh. 16 - Prob. 76GPCh. 16 - Prob. 77GPCh. 16 - Prob. 78GPCh. 16 - Prob. 79GPCh. 16 - Prob. 80GPCh. 16 - Prob. 81GPCh. 16 - Prob. 82GPCh. 16 - Prob. 83GPCh. 16 - Prob. 84GPCh. 16 - Prob. 85GPCh. 16 - Prob. 86GPCh. 16 - Prob. 87GPCh. 16 - Prob. 88GPCh. 16 - Prob. 89GPCh. 16 - Prob. 90GPCh. 16 - Prob. 91GPCh. 16 - Prob. 92GPCh. 16 - Prob. 93GPCh. 16 - Prob. 94GPCh. 16 - Prob. 95GPCh. 16 - Prob. 96GPCh. 16 - Prob. 97GPCh. 16 - Prob. 98GPCh. 16 - Prob. 99GPCh. 16 - Prob. 100GPCh. 16 - Prob. 101GPCh. 16 - Prob. 102GPCh. 16 - Prob. 103GPCh. 16 - Prob. 104GP
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- Some studies suggest that the upper frequency limit of hearing is determined by the diameter of the eardrum. The wavelength of the sound wave and the diameter of the eardrum are approximately equal at this upper limit. If the relationship holds exactly, what is the diameter of the eardrum of a person capable of hearing 20 000 Hz? (Assume a body temperature of 37.0C.)arrow_forwardIf the aluminum rod in Example 18.6 were free at both ends, what audible frequencies would be heard? Compare your results with the results of Example 18.6 and explain the difference.arrow_forwardA dB meter registered 125 dB when it was placed 3.90 m in front of a speaker. (i) Calculate the power output of the speaker, assuming uniform spherical spreading of the sound and negligible absorption by the air.arrow_forward
- (b) Consider the speaker set-up in the previous question. Each speaker emits a frequency of 6.6 102 Hz in phase with the other. The listener is seated directly in front of one speaker, 1.6 m away. The speakers are 2.4 m away from each other. How many extra wavelengths are needed for sound to get from speaker 2 to the listener? Take the speed of sound in air to be 3.4 102 m/s. Extra wavelengths |x,-x2|/A:| (c) What kind of interference, if any, does the listener in the previous question experience? There is not enough information to tell Destructive interference Constructive interference No interferencearrow_forward(c) Two identical speakers are placed at the positions X and Y, as shown in the following figure. The separation distance between the positions X and Y is 4.9 m. When both speakers are working in phase under a frequency of 159 Hz, calculate the minimum distances of YZ and XZ, such that destructive interference would occur at the position Z. The speed of sound is 344 m/s. Hint: XY>YZ. X Z Two speakers at the positions X and Y (not to scale)arrow_forwardAn FM communication system has a sensitivity of 4 kHz/V. How much deviation (in Hz) does it produce with a sine wave input of 19.66 Vpeak at a frequency of 4.8 kHz?arrow_forward
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- Problem 12: Two speakers placed 0.98 m apart produce pure tones in sync with each other at a frequency of 1225 Hz. A microphone can be moved along a line parallel to the line joining the speakers and 9.6 m from it. An intensity maximum is measured a point Po where the microphone is equidistant from the two speakers. As we move the microphone away from Po to one side, we find intensity minima and maxima alternately. Take the speed of sound in air to be 344 m/s, and you can assume that the slits are close enough together that the equations that describe the interference pattern of light passing through two slits can be applied here. Part (a) What is the distance, in meters, between Po and the first intensity minimum? ly'₁l = 1 ~Part (b) What is the distance, in meters, between Po and the first intensity maximum? Part (c) What is the distance, in meters, between Po and the second intensity minimum? Part (d) What is the distance, in meters, between Po and the second intensity maximum? Part…arrow_forward2 In Fig. 17-25, two point sources S. S, and S2, which are in phase, emit identical sound waves of wave- S,. length 2.0 m. In terms of wave- lengths, what is the phase differ- ence between the waves arriving at point P if (a) L1 = 38 m and L2 = 34 m, and (b) L, = 39 m and L2 = 36 m? (c) Assuming that the source separation is much smaller than L1 and L2, what type of interference occurs at P in situations (a) and (b)? Figure 17-25 Question 2.arrow_forwardTwo speakers connected to the same frequency generator emit a sound with afrequency of 500 Hz. As a person walks around in the room, he finds areas wherethe sound becomes loud and clear and areas where it is more muffled. At one spotwhere the sound is a maximum, the student is 3.2 m from one speaker. What isthe closest possible distance he could be to the other speaker?arrow_forward
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