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Exam 16: Waves and Sound

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Question 21

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A guitar string is plucked and set into vibration.The vibrating string disturbs the surrounding air, resulting in a sound wave.Which entry in the table below is correct? wave in the string sound wave in air

A) The wave is transverse.yes yes
B) The wave speed increases no yes if the temperature rises.
C) The wave is longitudinal.yes yes
D) The wave is transmitted no yes by particle vibrations.
E) The wave transports energy.yes no

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Question 22

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The speaker and two microphones shown in the figure are arranged inside a sealed container filled with neon gas.The wires from the microphones are connected to an oscilloscope (not shown) .The signal from the microphones is monitored beginning at time t = 0 s when a sound pulse is emitted from the speaker.The pulse is picked up by microphone 1 at t₁ = 1.150 × 10^-2 s and by microphone 2 at t₂ = 1.610 × 10^-2 s.What is the speed of sound in neon gas?

A) 124 m/s
B) 174 m/s
C) 362 m/s
D) 435 m/s
E) 724 m/s

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Question 23

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16-2 The diagram shows the various positions of a child in motion on a swing.Somewhere in front of the child a stationary whistle is blowing. -At which position(s) will the child hear the highest frequency for the sound from the whistle?

16-2 The diagram shows the various positions of a child in motion on a swing.Somewhere in front of the child a stationary whistle is blowing. -At which position(s) will the child hear the same frequency as that heard by a stationary observer standing next to the whistle?

16-5 A periodic traveling wave is generated on a string of linear density 8.0 × 10^-4 kg/m.Figure A shows the displacements of the particles in the string as a function of the position x along the string at t = 0 s.Figure B shows the displacement of the particle at x = 0 m as a function of time.The particle positions are measured from the left end of the string (x = 0 m) and the wave pulses move to the right. -What is the wavelength of the wave?

A car moving at 35 m/s approaches a stationary whistle that emits a 220 Hz sound.The speed of sound is 343 m/s.What is the frequency of sound heard by the driver of the car?

An unstretched spring has a length of 0.30 m.When the spring is stretched to a total length of 0.60 m, it supports traveling waves moving at 4.5 m/s.How fast will waves travel on this spring if it is stretched to 0.90 m?

The displacement of a vibrating string versus position along the string is shown in the figure.The periodic waves have a speed of 10.0 cm/s.A and B are two points on the string. -A steel wire of mass 0.400 kg and length 0.640 m supports a 102-kg block.The wire is struck exactly at its midpoint causing a small displacement.How long does it take the peak of this displacement to reach the top of the wire?

A wave is traveling at 35 m/s on a string with a linear density of 0.082 kg/m.What is the tension in the string?

A source moving through water at 10.0 m/s generates water waves with a frequency of 5.0 Hz.The speed of these water waves relative to the water surface is 20.0 m/s.The source approaches an observer who is at rest in the water.What wavelength would be measured for these waves by the stationary observer?

The displacement of a vibrating string versus position along the string is shown in the figure.The periodic waves have a speed of 10.0 cm/s.A and B are two points on the string. -What is the wavelength of the wave?

A bell is ringing inside of a sealed glass jar that is connected to a vacuum pump.Initially, the jar is filled with air.What does one hear as the air is slowly removed from the jar by the pump?

At a distance of 5.0 m from a point sound source, the sound intensity level is 110 dB.At what distance is the intensity level 95 dB?

What is the wavelength of a wave with a speed of 9.0 m/s and a period of 0.33 s?

Of the three traveling waves listed below, which one(s) is(are) traveling in the +x direction?

The displacement of a vibrating string versus position along the string is shown in the figure.The periodic waves have a speed of 10.0 cm/s.A and B are two points on the string. -What is the frequency of the wave?

A bell emits sound energy uniformly in all directions at a rate of 4.00 × 10^-3 W.What is the intensity of the wave 100.0 m from the bell?

A periodic wave travels along a stretched string in the direction shown by the arrow.The sketch shows a "snapshot" of the pulse at a certain instant.Points A, B, and C are on the string.Which entry in the table below correctly describes how particles of string between A and B and between B and C are moving? between A and B between B and C

The displacement of a vibrating string versus position along the string is shown in the figure.The periodic waves have a speed of 10.0 cm/s.A and B are two points on the string. -A certain string on a piano is tuned to produce middle C (f = 261.63 Hz) by carefully adjusting the tension in the string.For a fixed wavelength, what is the frequency when this tension is tripled?

How far must one stand from a 5-mW point sound source if the intensity at that location is at the hearing threshold? Assume the sound waves travel to the listener without being disturbed.