Please solve 22 B. four times as intense as a sound of 20 dBC. 10 tímes as intense as a sound of 20 dBD. 100 times as intense as a sound of 20 dBE. 1000 times as intense as a sound of 20 dB20. Consider two pipes of the same length: one pipe is open at both ends and the other pipe isclosed on one end but open at the other end. If the fundamental frequency of the pipe open atboth ends is 200 Hz, what is the fundamental frequency of the other pipe?A. 100 HzB. 200 HzС. 300 HzD. 400 HzE. 800 Hz21. What can you say about Coulomb forces between two charges +1uC and +2µC separated bythe distance 1 umA. The forces are directed along the line connecting two chargesB. The forces are repulsiveC. The forces would increase if we decrease the distance between these two chargesD. The forces of gravity between charges are weaker than the Coulomb forcesE. All of the above is correct22. What is the magnitude of the electric field directed up that will balance the weight of acharge +3.0 nC with the mass 3 g ?A. 1.9 x 10° N/CB. 4.9 x 10 N/CC. 9.8 x 10° N/CD. 0.9 x 10° N/CE. 0.5 x 10° M23. Two identical light bulbs consume 60 W of the total average power when plugged inAC outlet being connected in series. What is the resistance of one light bulb?A. 302В. 60 2C. 1202D. 240 2E. 480 2

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20. Consider two pipes of the same length: one pipe is open at both ends and the other pipe is closed on one end but open at the other end. If the fundamental frequency of the pipe open at both ends is 200 Hz, what is the fundamental frequency of the other pipe? A. 100 Hz B. 200 Hz C. 300 Hz D. 400 Hz E. 800 Hz

20. Consider two pipes of the same length: one pipe is open at both ends and the other pipe is closed on one end but open at the other end. If the fundamental frequency of the pipe open at both ends is 200 Hz, what is the fundamental frequency of the other pipe? A. 100 Hz B. 200 Hz C. 300 Hz D. 400 Hz E. 800 Hz

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter17: Physics Of Hearing

Section: Chapter Questions

Problem 53PE: (a) Students in a physics lab are asked to find the length of an air column in a tube closed at one...

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(a) How much more intense is a sound that has a level 17.0 dB higher man another? (b) If one sound has a level 23.0 dB less than another, what is the ratio of their intensi?es?
A family ice show is held at an enclosed arena. The skaters perform to music with level 80.0 dB. This level is too loud for your baby, who yells at 75.0 dB. (a) What total sound intensity engulfs you? (b) What is the combined sound level?
(a) What is the decibel level of a sound that is twice as intense as a 90.0dB sound? (b) What is the decibel level of a sound that is one—?fth as intense as a 90.0—dB sound?
A crude approximation at voice production is to consider the breathing passages and mouth to be a resonating tube closed at one end. (See Figure 17.30.) (a) What is the fundamental frequency if the tube is 0.240-m long, by taking air temperature to be 37.0°C? (b) What would this frequency become it the person replaced the air with helium? Assume the same temperature dependence for helium as for air. Figure 17.30 The throat and mouth form an air column closed at one end that resonates in response to vibrations in the voice box. The spectrum of overtones and their intensities vary with mouth shaping and tongue position to form different sounds. The voice box can be replaced with a mechanical vibrator, and understandable speech is still possible. Variations in basic shapes make different voices recognizable.
(a) What is the intensity of a sound that has a level 7.00 dB lower than a 4.00109W/m2 sound? (b) What is the intensity of a sound that is 3.00 dB higher than a 4.00109W/m2 sound?
(a) Find the length of an organ pipe closed at one end that produces a fundamental frequency of 256 Hz when air temperature is 18.0°C. (b) What is its fundamental frequency at 25.0°C?
Suppose all six equal-length strings of an acoustic guitar are played without fingering, that is, without being pressed down at any frets. What quantities are the same for all six strings? Choose all correct answers. (a) the fundamental frequency (b) the fundamental wavelength of the siring wave (c) the fundamental wavelength of the sound emitted (d) the speed of the string wave (e) the speed of the sound emitted
A 512-Hz tuning fork is struck and placed next to a tube with a movable piston, creating a tube with a variable length. The piston is slid down the pipe and resonance is reached when the piston is 115.50 cm from the open end. The next resonance is reached when the piston is 82.50 cm from the open end. (a) What is the speed of sound in the tube? (b) How far from the open end will the piston cause the next mode of resonance?
An outside loudspeaker (considered a small source) emits sound waves with a power output of 100 W. (a) Find the intensity 10.0 m from the source. (b) Find the intensity level in decibels at that distance. (c) At what distance would you experience the sound at the threshold of pain, 120 dB?
Based on the graph in Figure 17.36, what is the threshold of hearing in decibels for frequencies of 60, 400, 1000, 4000, and 15,000 Hz? Note that many AC electrical appliances produce 60 Hz, music is commonly 400 Hz, a reference frequency is 1000 Hz, your maximum sensitivity is near 4000 Hz, and many older TVs produce a 15,750 Hz whine. Figure 17.36 The relationship of loudness in phons to intensity level (in decibels) and intensity (in watts per meter squared) for persons with normal hearing. The curved lines are equal-loudness curves—all sounds on a given curve are perceived as equally loud. Phons and decibels are defined to be the same at 1000 Hz.
(a) What is the intensity in watts per meter squared of a just barely audible ZUD—Hz sound? (b) What is the intensity in watts per meter squared of a barely audible 4000—Hz sound?
Suppose that the sound level from a source is 75 dB and then drops to 52 dB, with a frequency of 600 Hz. Determine the (a) initial and (b) final sound intensities and the (c) initial and (d) final sound wave amplitudes. The air temperature is TC=24.00C and the air density is =1.184kg/m3 .