Physics Exam 1

Threshold of hearing

20 uPa 0 dB

Traffic

63,000 uPa 50 dB

Normal Conversation

20,000 uPa 60dB

Whisper

200 uPa 20 dB

Threshold of pain

200,000,000 uPa 140 dB

Lawnmower or subway

630,000 uPa 90 dB

What is the wavelength of a 680 Hz sound wave if the speed of sound in air is 340 m/s? A. 0.5 m B. 2 m C. 231.2 m D. 231200 m

A. 0.5 m

The lowest resonance mode frequency for C215 (our classroom) would be _____ ? Assume the dimensions are 14 m x 12 m x 3 m. A. 12 Hz B. 14 Hz C. 24 Hz D. 57 Hz

A. 12 Hz

Suppose you clap your hands loudly, then hear an echo 0.1 seconds later. How far away is the surface that causes the echo? Assume the speed of sound in air is 340 m/s. A. 17 m B. 34 m C. 1700 m D. 3400 m

A. 17 m

If the period of an oscillator is 0.5 seconds, what is the frequency of the oscillation? A. 2 Hz. B. 5 Hz. C. 10 Hz. D. 50 Hz.

A. 2 Hz.

Which arrangement of instruments can be used to show the time-dependent waveform (sound) of a clarinet tone? A. A microphone connected to an oscilloscope. B. A microphone connected to a spectrum analyzer. C. A pickup connected to a spectrum analyzer. D. A pickup connected to an oscilloscope.

A. A microphone connected to an oscilloscope.

Which of the following best describes a natural mode of vibration? A. A specific vibration pattern in which a system moves repeatedly. B. Any vibration produced on a system by a restoring force. C. An undefined vibration pattern for a system with fixed end points. D. The motion of a set of blocks attached to springs.

A. A specific vibration pattern in which a system moves repeatedly.

Which of the following is a true statement about the relationship between the spring stiffness, the mass, and the natural frequency of a mass-spring vibrator? A. If the spring stiffness increases, the natural frequency increases. B. If the mass increases, the natural frequency increases. C. If the spring stiffness doubles, the natural frequency decreases to one-half the original value. D. If the mass doubles, the natural frequency decreases to one-half the original value.

A. If the spring stiffness increases, the natural frequency increases.

Suppose a string has an initial wave speed of 2 m/s. When the tension on the string is doubled from its original value, what happens to the speed of waves on the string? A. It increases. B. It decreases. C. It stays the same as the original value.

A. It increases.

Echoes are commonly produced by which wave phenomenon? A. Reflection. B. Refraction. C. Diffraction. D. The Doppler effect.

A. Reflection.

According to Table 12.3 of the textbook, which of the following activities would expose you to the highest sound pressure level? A. Riding inside a subway. B. Using a food blender. C. Being in a typical factory. D. Riding in a car going 55 MPH.

A. Riding inside a subway.

In old western movies, a character often puts his ear to the ground to hear if something is coming. Which of the following statements accurately describes what is happening? A. Sound travels faster in solids (the ground) than in gases (the air), so he can hear the sound sooner through the ground. B. Sound travels slower in solids (the ground) than in gases (the air), so he can hear the sound sooner through the ground. C. Sound travels slower in solids (the ground) than in gases (the air), so he can hear the sound louder through the ground.

A. Sound travels faster in solids (the ground) than in gases (the air), so he can hear the sound sooner through the ground.

Which of the following activities requires the shortest reverberation time? A. Speech. B. Chamber music. C. Opera. D. Organ music.

A. Speech.

Select ALL the TRUE statements regarding acoustic intensity of a sound radiating from a noise source, such as a loudspeaker? (Mark more than one.) A. The intensity of the sound wave decreases as the sound travels outward from an acoustic source. B. The intensity of the sound wave increases as the sound travels outward from an acoustic source. C. The intensity of the sound wave stays the same at all distances from the source. D. The intensity of the sound wave directly depends on distance. E. The change in the intensity of the sound wave from one point to another depends on the ratio of the squared distances.

A. The intensity of the sound wave decreases as the sound travels outward from an acoustic source. E. The change in the intensity of the sound wave from one point to another depends on the ratio of the squared distances.

What happens when a wave is completely reflected from the fixed end of a string or the open end of a tube? A. The reflected wave has the same amplitude as the incident wave but has the opposite phase, meaning it is inverted. B. The reflected wave has the same amplitude and phase as the incident wave. C. The reflected wave has a larger amplitude than the incident wave but has the same phase. D. The reflected wave has a smaller amplitude than the incident wave and has the opposite phase, meaning it is inverted.

A. The reflected wave has the same amplitude as the incident wave but has the opposite phase, meaning it is inverted.

Diffraction effects occur with sound passing through a small opening. If sound containing several frequencies passes through this opening, how will the frequency content of the sound in front of the opening compare to that of the sound to the side of the opening? A. The sound in front of the opening contains more high-frequency content than that at the side. B. The sound in front of the opening contains less high-frequency content than that at the side. C. Both high-frequency and low-frequency energy must be distributed uniformly as it passes through the opening. D. Only the high-frequency energy is distributed uniformly after it passes through the opening.

A. The sound in front of the opening contains more high-frequency content than that at the side.

Assuming a tuning fork produces a pure tone (simple wave), describe the frequency spectrum of that tone. A. There is only a single frequency peak or line. B. There are a few frequency peaks that are harmonically related to the fundamental frequency. C. There are some frequency peaks that are harmonically related to the fundamental frequency and some that are inharmonically related. D. There are a few frequency peaks that are inharmonically related to the fundamental frequency.

A. There is only a single frequency peak or line.

The human voice producing a steady vowel sound is considered A. a driven system with a spectrum containing harmonic partials. B. a driven system with a spectrum containing inharmonic partials. C. a free system with a spectrum containing harmonic partials. D. a free system with a spectrum containing inharmonic partials.

A. a driven system with a spectrum containing harmonic partials.

The atmospheric pressure at sea level is 100,000 Pa. On BYU campus (approximate elevation 4500 ft), the atmospheric pressure is about 89,000 Pa. What would be the approximate atmospheric pressure at the top of Mt. Timpanogos (elevation 12,000 ft)? Hint: consider how pressure varies with elevation. A. around 70,000 Pa B. around 89,000 Pa C. around 100,000 Pa D. around 230,000 Pa

A. around 70,000 Pa

Select the type of energy conversion performed by guitar pickups. A. mechanical to electrical B. acoustical to electrical C. electrical to acoustical D. mechanical to acoustical

A. mechanical to electrical

The perceptual attribute of spaciousness depends on ____________. A. the binaural quality index. B. the early/late ratio. C. the reverberation time. D. the initial time delay gap.

A. the binaural quality index.

The addition of people in a room changes the total absorption of the room. It just so happens that C215 has a maximum capacity of 167 people for that room. What would the RT be if the room was fully occupied with 167 people, at 500 Hz? A. 0.01 sec B. 0.65 sec C. 1.64 sec D. 10 sec

B. 0.65 sec

What is the approximate reverberation time at 500 Hz in a 6 x 8 x 3 m living room with heavy carpet on the floor and plastered walls and ceilings? (Regular plaster NOT acoustical plaster.) Would this be good for normal conversation or for enjoying a piece played on the piano? A. 0.27 sec, which is short enough for good conversation and ideal for listening to chamber music. B. 0.65 sec, which is short enough for good conversation but not the optimum for listening to an organ. C. 0.64 sec, which doesn't allow understanding of speech and ideal for listening to opera music. D. 1.2 sec, which is too long for good conversation but ideal for listening to the organ.

B. 0.65 sec, which is short enough for good conversation but not the optimum for listening to an organ.

The dimensions of C215 are 14 m x 12 m x 3 m. Given an average absorption coefficient of 0.10 for the room at 500 Hz, what is the reverberation time for this room? A. 0.16 seconds B. 1.64 seconds C. 10 seconds D. 806 seconds

B. 1.64 seconds

Suppose a string is 0.5 m (50 cm) long, is fixed at both ends, and has a wave speed of 10 m/s. Select the list of natural frequencies associated with the first three natural modes of the string. A. 5, 10 and 15 Hz. B. 10, 20 and 30 Hz. C. 20, 40 and 60 Hz. D. 50, 100 and 150 Hz.

B. 10, 20 and 30 Hz.

Suppose the acoustic pressure of a normal conversation in an outdoor setting is 20,000 μPa at a distance of 1 m. What is the acoustic pressure at a point 2 m away? A. 5,000 μPa B. 10,000 μPa C. 20,000 μPa D. 40,000 μPa

B. 10,000 μPa

Suppose sound waves are spreading out uniformly in all directions from a small sound source. If the sound pressure of the sound waves at 1 m from the source is 4 Pa, what is the sound pressure of the sound waves at 2 m? A. 1 Pa B. 2 Pa C. 4 Pa D. 8 Pa

B. 2 Pa

A wave has a frequency of 30 Hz and a wavelength of 0.1 m. What is the speed of the wave? A. 0.3 m/s B. 3 m/s C. 30 m/s D. 3000 m/s

B. 3 m/s

Suppose an air-filled tube is 15 cm long and is open at both ends. Calculate the wavelengths for the first two natural modes (standing waves) in the tube. Assume the speed of sound in air is 340 m/s. A. 15 cm and 7.5 cm. B. 30 cm and 15 cm. C. 60 cm and 20 cm. D. 113 cm and 226 cm.

B. 30 cm and 15 cm

f a listener is traveling at 34 m/s (76 MPH) away from a horn producing a 440 Hz tone, what frequency will the person perceive? A. 44 Hz. B. 396 Hz. C. 484 Hz. D. 4400 Hz.

B. 396 Hz.

Calculate the sound pressure level in dB relative to 20 μPa (20 micropascals) produced by an acoustic pressure of 40,000 μPa. A. 3.3 dB B. 66 dB C. 72 dB D. 2000 dB

B. 66 dB

If sound pressure doubles from 20,000 μPa to 40,000 μPa, the sound pressure level changes from 60 dB to A. 120 dB B. 66 dB C. 54 dB D. 30 dB

B. 66 dB

The lowest resonance frequency for a typical shower stall would approximately be _____ ? You need to guess at the dimensions or go and actually measure some. Only one answer choice will make physical sense. A. 20 Hz B. 70 Hz C. 600 Hz D. 2000 Hz

B. 70 Hz

Which arrangement of instruments can be used to view the spectrum of a trumpet tone? A. A microphone connected to an oscilloscope. B. A microphone connected to a spectrum analyzer. C. A pickup connected to a spectrum analyzer. D. A pickup connected to an oscilloscope.

B. A microphone connected to a spectrum analyzer.

Assume that on summer days the air near the ground is warmer than the air higher above the ground, while the opposite is true at night. When will an outdoor band concert be heard over greater distances? A. During the day. B. During the night. C. Right before sunset. D. There is no difference for the different times of day.

B. During the night.

A typical control room (like a recording studio or mixing booth room) would have a lowest resonance frequency that is significantly lower than the lowest one in a typical concert hall. A. True B. False

B. False

Which acoustic quantity remains the same as a wave travels from one medium (substance) to another? A. Wavelength. B. Frequency. C. Wave speed. D. The product of the frequency and the wavelength.

B. Frequency.

Which of the following is a property of a complex wave composed only of harmonic partials? A. It has a single pronounced peak on its frequency spectrum. B. It is a periodic wave. C. It is a nonperiodic wave. D. It has a smooth frequency spectrum.

B. It is a periodic wave.

Which of the following transducers is NOT an acoustic receiver? A. Human ear. B. Loudspeaker. C. Microphone. D. Hydrophone (underwater sound sensor).

B. Loudspeaker.

One wavelength of a sound wave is the distance from A. A condensation to the following rarefraction. B. One condensation to the next condensation. C. One rarefraction to the next condensation.

B. One condensation to the next condensation.

The bending of sound waves caused by temperature changes in the air is an example of A. Reflection. B. Refraction. C. Diffraction. D. The Doppler effect.

B. Refraction.

As part of the standard tour of the Salt Lake Tabernacle, a tour guide drops a pin on a wooden table near the podium at the front of the hall. Listeners can easily hear the pin drop at considerable distances away. Which of the following characteristics might enable a listener at the back of the hall to hear the pin drop near the podium? A. The sound shadow of the balcony. B. Sound focusing from the concave ceiling. C. Flutter from parallel walls. D. A resonance of the room associated with the distance between walls.

B. Sound focusing from the concave ceiling.

When identical notes are played on different instruments, they produce distinctly different sounds. Which of the following does NOT contribute to that fact? A. The instruments are different shapes and sizes, which means they support standing waves differently. B. The instruments are manufactured with different colors. Lighter colors usually produce brighter sounds or tone colors. C. The instruments have different means of producing their sounds. D. Some instruments are driven systems and some are free systems.

B. The instruments are manufactured with different colors. Lighter colors usually produce brighter sounds or tone colors.

If a loudspeaker outputs 500 J, which of the following is TRUE about the sound intensity 1 m from the source vs 2 m from the source? A. Both locations have the same sound intensity. B. The intensity at 1 m is larger than at 2 m. C. The intensity at 2 m is larger than the intensity at 1 m. D. There is not enough information to determine how the sound intensity changes.

B. The intensity at 1 m is larger than at 2 m.

Why CAN'T transverse waves travel through fluids (i.e., liquids and gases)? A. The molecules in a fluid cannot move perpendicular to each other. B. The molecules in a fluid are not strongly bound together; they do not have sufficient restoring force to return to their original positions. C. The molecules in a fluid are not heavy enough to transmit a vibrational wave.

B. The molecules in a fluid are not strongly bound together; they do not have sufficient restoring force to return to their original positions.

What happens when a compound (multi-mass) vibrator is driven at any one of its natural frequencies (assume there is no damping in the system)? A. A complex vibration pattern is produced. B. The resulting vibration pattern is one of the normal modes of the system. C. The resulting vibration pattern is a combination of the normal modes of the system. D. All points on the compound vibrator will experience large changes in amplitude as it oscillates.

B. The resulting vibration pattern is one of the normal modes of the system.

Select ALL the TRUE statements regarding sound power? (Mark more than one.) A. The sound power from a loudspeaker indicates how much force is produced per unit area. B. The sound power from a loudspeaker indicates how much sound energy is produced per unit time. C. The sound power from a loudspeaker indicates how much acoustic pressure is produced per unit time. D. The sound power produced by a loudspeaker is related to the loudness (volume) at which it is operated. E. The units for power is Joules (J).

B. The sound power from a loudspeaker indicates how much sound energy is produced per unit time. D. The sound power produced by a loudspeaker is related to the loudness (volume) at which it is operated.

Suppose you have two strings with the same length and same tension, but one weighs more than the other. How do the wave speeds on the two strings compare? A. The wave speed on the heavier string is greater than that on the lighter string. B. The wave speed on the heavier string is less than that on the lighter string. C. The wave speed on both strings is the same.

B. The wave speed on the heavier string is less than that on the lighter string.

The displacement of a standing wave on a string fixed at both ends and the pressure of a standing wave in a tube open at both ends share which characteristic? A. They both have antinodes at both ends. B. They both have nodes at both ends. C. They both have an antinode at the left end and a node at the right end. D. They both have a node at the left end and an antinode at the right end.

B. They both have nodes at both ends.

Select ALL the TRUE statements regarding force and pressure. (Mark more than one.) A. When the same force is applied on two objects the heavier object experiences the larger acceleration. B. When the same force is applied on two objects the less massive object experiences the larger acceleration. C. When the same force is applied on two objects the object with the larger surface area experiences the larger pressure. D. When the same force is applied on two objects the object with the smaller surface area experiences the larger pressure. E. The units of pressure are Pascals (Pa), which is the same as N/m2.4

B. When the same force is applied on two objects the less massive object experiences the larger acceleration. D. When the same force is applied on two objects the object with the smaller surface area experiences the larger pressure. E. The units of pressure are Pascals (Pa), which is the same as N/m2.4

Select the type of energy conversion performed by a microphone. A. mechanical to electrical B. acoustical to electrical C. electrical to acoustical D. mechanical to acoustical

B. acoustical to electrical

Performers will be able to hear each other well in a hall and have a good sense of ensemble if _________________. A. the concert hall has a long reverberation time. B. they hear sufficient early reflected sound from surfaces near the stage. C. they play their instruments loudly. D. the stage is both wide and high so reflecting surfaces are very distant.

B. they hear sufficient early reflected sound from surfaces near the stage.

What is the acoustic pressure (in micropascals) that produces a sound pressure level of 40 dB? A. 100 μPa B. 200 μPa C. 2,000 μPa D. 4,000 μPa

C. 2,000 μPa

Suppose an ambulance siren emits a steady frequency of 2000 Hz while it moves with a speed of 17 m/s (38 MPH) toward a stationary listener. What is the approximate frequency the listener will perceive? Assume the speed of sound in air is 340 m/s. A. 100 Hz. B. 1900 Hz. C. 2100 Hz. D. 4000 Hz.

C. 2100 Hz.

What is the frequency of a wave on a string if the wavelength is 0.25 m and the wave speed of the string is 1 m/s? A. 0.25 Hz B. 2.5 Hz C. 4 Hz D. 25 Hz

C. 4 Hz

If the sound pressure from a food blender is 200,000 μPa at a distance of 1 m, what would you expect the sound pressure to be at a point 0.5 m away? A. 50,000 μPa B. 100,000 μPa C. 400,000 μPa D. 800,000 μPa

C. 400,000 μPa

Suppose a tuning fork with a frequency of 440 Hz is struck while someone is playing a note on the clarinet. A listener hears a beat frequency of 3 beats per second. Which of the following could be the frequency of the clarient tone? A. 3 Hz B. 330 Hz C. 437 Hz D. 1320 Hz

C. 437 Hz

How many antinodes would there be for the sixth natural mode of the vibrating string with fixed ends? A. 3 B. 6 C. 7 D. 9

C. 7

How many natural modes of vibration are there for a set of seven masses attached to a string? A. 1 B. 3 C. 7 D. 14

C. 7

If the sound pressure level of a lawnmower is 80 dB at a distance of 1 m, what is the sound pressure level at a distance of 2 m? A. 40 dB B. 68 dB C. 74 dB D. 86 dB

C. 74 dB

Which of the following lists of frequencies represents a fundamental and three harmonic partials? A. 75, 100, 125, 150 Hz. B. 75, 150, 200, 275 Hz. C. 75, 150, 225, 300 Hz. D. 75, 152, 226, 297 Hz.

C. 75, 150, 225, 300 Hz.

Which arrangement of instruments can be used to make computer music (i.e., a digital music file) audible? A. A microphone connected to an A/D converter connected to a computer. B. A microphone connected to a spectrum analyzer. C. A computer connected to an D/A converter connected to a loudspeaker. D. A computer connected to a spectrum analyzer connected to a loudspeaker.

C. A computer connected to an D/A converter connected to a loudspeaker.

The clarity of an auditorium depends most strongly on what factor? A. A high binaural quality index. B. A long reverberation time. C. A large early/late ratio. D. A long early decay time.

C. A large early/late ratio.

If you needed to line a wall with material that would absorb primarily high frequencies, which material should you choose? (See Table 21.1) A. Plaster. B. Plywood paneling. C. Heavy draperies. D. Brick.

C. Heavy draperies.

Suppose you are sitting in a concert hall. The earliest reflected sound that reaches you within 20-30 ms of the direct sound contribute to a feeling of __________ in the hall. A. Clarity B. Reverberance C. Intimacy D. Echoes

C. Intimacy

How does the RT calculated in questions 4 and 5, for C215 without and with people in it, compare to the optimal times for speech in that room? A. It is too long with or without people in it to understand speech well. B. It is too short with or without people in it to understand speech well. C. It is too long without people in it and just about right with people in it. D. It was optimal without people in the room but too short with people in the room.

C. It is too long without people in it and just about right with people in it.

Which of the following transducers in NOT an acoustic generator? A. Human voice. B. Loudspeaker. C. Microphone. D. Piano.

C. Microphone.

Which of the following does NOT start a transverse wave? A. Shaking one end of a jumprope up and down. B. Plucking a violin string. C. Singing a long, high note. D. Starting the human "wave" in the football stadium (assuming the other fans respond).

C. Singing a long, high note.

A complex wave is composed of four sine waves with frequencies 150, 297, 450, 602, and 750 Hz. Describe how the upper four frequencies are related to the fundamental. A. All are harmonics. B. All are slightly inharmonic. C. Some are harmonic and some are slightly inharmonic. D. All are very inharmonic.

C. Some are harmonic and some are slightly inharmonic.

You can clearly hear someone speaking to you from a different room even when you cannot see them. This is because A. Sound waves are refracted while light waves cannot be refracted. B. Sound waves are diffracted while light waves cannot be diffracted. C. Sound waves are diffracted more strongly through the doorway than light waves. D. Sound waves are diffracted less strongly through the doorway than light waves.

C. Sound waves are diffracted more strongly through the doorway than light waves.

When you blow across the mouth of a soft-drink bottle, you observe a pitch. How is the air-bottle system similar to a mass spring system? (Hint: See question 4.10 at the end of Chapter 4.) A. The air in the bottle moves to provide the mass and any liquid in the bottle provides the stiffness. B. The air in the neck of the bottle provides the stiffness and the air below the neck and above any liquid in the bottle moves to provide the mass. C. The air in the neck of the bottle moves to provide the mass, and the air below the neck and above any liquid in the bottle provides the stiffness.

C. The air in the neck of the bottle moves to provide the mass, and the air below the neck and above any liquid in the bottle provides the stiffness.

Why does a freely swinging pendulum eventually cease its motion? A. Its potential energy is converted into electrical energy. B. Its kinetic energy is converted into potential energy. C. The friction at the point of contact causes the energy of the system to dissipate as heat. D. The friction at the point of contact causes the energy of the system to be absorbed by the pendulum's mass.

C. The friction at the point of contact causes the energy of the system to dissipate as heat.

In a certain concert hall suppose that at one specific seat location the first reflection of sound travels an extra 20 meters as compared to the direct sound path. Question 1: How much longer in time will it take the reflected sound to arrive after the direct sound? Question 2: Will the reflected sound be perceived as an echo? A. The reflected sound will arrive 20 ms later, perceived as an echo. B. The reflected sound will arrive 20 ms later, with no echo perceived. C. The reflected sound will arrive 59 ms later, perceived as an echo. D. The reflected sound will arrive 59 ms later, with no echo perceived. E. The reflected sound will arrive 0.059 ms later, perceived as an echo. F. The reflected sound will arrive 0.059 ms later, with no echo perceived.

C. The reflected sound will arrive 59 ms later, perceived as an echo.

Which type of microphone utilizes a coil of wire like common loudspeakers do? A. condenser microphone B. ribbon microhpone C. dynamic microphone D. electret microphone

C. dynamic microphone

What is the difference between 10 N and 10 N/m2 ? A. 10 N is much larger than 10 N/m2. B. 10 N/m2 is much larger than 10 N. C. 10 N/m2 gives the force and 10 N is a weight. D. 10 N gives the force and 10 N/m2 indicates the pressure.

D. 10 N gives the force and 10 N/m2 indicates the pressure.

How much energy does a 10-W amplifier supply to a loudspeaker in 12 sec? A. 0.83 J B. 1.2 J C. 12 J D. 120 J

D. 120 J

The receiving surface of your ear drum is approximately 5.5 x10-5 m2. If the force on your eardrum from a sound is 1.10 x 10-4 N, what is the corresponding acoustical pressure? (This pressure corresponds to a sound level of 100 dB, approximately the loudness of a lawnmower or thunder.) A. 0.2 N B. 2.2 N C. 0.02 Pa D. 2 Pa

D. 2 Pa

What is the beat frequency if two tones of 300 and 305 Hz are sounded simultaneously? A. 605 Hz. B. 302.5 Hz C. 161.25 Hz D. 5 Hz

D. 5 Hz

Suppose an air-filled tube is closed at one end and open at the other end, and has a fundamental frequency of 200 Hz. Select the correct list for the next three natural frequencies. A. 300, 400, 500 Hz. B. 400, 600, 800 Hz. C. 400, 800, 1600 Hz. D. 600, 1000, 1400 Hz.

D. 600, 1000, 1400 Hz.

If the sound pressure level of a heavy truck is 85 dB at a distance of 16 m, what is the sound pressure level at a distance of 4 m from the truck? A. 73 dB B. 79 dB C. 91 dB D. 97 dB

D. 97 dB

Which arrangement of instruments can be used to represent the time-varying waveform corresponding to the mechanical motion of a point on a guitar string? A. A microphone connected to an oscilloscope. B. A microphone connected to a spectrum analyzer. C. A pickup connected to a spectrum analyzer. D. A pickup connected to an oscilloscope.

D. A pickup connected to an oscilloscope.

The rapid succession of echoes commonly heard in a raquetball court is an example of A. Sound shadows B. Sound focusing C. Acoustical Glare D. Flutter

D. Flutter

Which of the following sets of measurements below were made in a good concert hall? A. G = 1.7dB, EDT = 1.0 s, ITDG = 60 ms B. G = 4 dB, EDT = 30 ms, ITDG = 1.9 s C. G = 1 dB, EDT = 1.9 s, ITDG = 1.9 s D. G = 5 dB, EDT = 1.8 s, ITDG = 25 ms

D. G = 5 dB, EDT = 1.8 s, ITDG = 25 ms

When a compound vibrator is excited in some general way (such as a violin string being bowed or an air column being stimulated by puffs of air through a reed), which of its natural modes will usually vibrate? [Note: we are able to "see" which modes vibrate by finding the peaks on a spectrum, which correspond to the natural frequencies of the normal modes contributing to the vibration. Also note that we are including effects of damping in this case.] A. Only the first mode. B. Only one mode, but not necessarily the first. C. All the modes with the same amplitude level. D. Many of the modes, but each will probably have a different amplitude level (some with very small amplitudes).

D. Many of the modes, but each will probably have a different amplitude level (some with very small amplitudes).

Which of the following activities typically requires the longest reverberation time? A. Speech. B. Chamber music. C. Opera. D. Organ music.

D. Organ music.

Which of the following is an example of a simple vibrator being DRIVEN at its resonance frequency? A. The vibration of a tuning fork after it has been struck. B. The motion that results from pulling down on a mass attached to a vertical spring and letting it go. C. Going bungee jumping. D. Pumping your legs to make your swing go higher.

D. Pumping your legs to make your swing go higher.

Sacred music during the Baroque period desired a high amount of reverberance and low clarity. Which of the following sets of objective measures would best correlate to these desired qualities? Hint: see Table 23.1. A. RT = 1.3 seconds, Early/late ratio is high B. RT = 1.3 seconds, Early/late ratio is low C. RT = 2.0 seconds, Early/late ratio is high D. RT = 2.0 seconds, Early/late ratio is low

D. RT = 2.0 seconds, Early/late ratio is low

Which of the following does NOT create a longitudinal wave? A. The sound resulting from playing a trumpet. B. Yelling to your friend across the street. C. Honking your car horn. D. Shaking one end of a string back and forth (left and right).

D. Shaking one end of a string back and forth (left and right).

Sound that reaches the listener's left and right ears differently (associated with BQI) contributes to a feeling of ___________ in a listening space. A. Clarity B. Intimacy C. Reverberance D. Spaciousness

D. Spaciousness

When a fire truck approaches you with its siren on, you hear a higher frequency than if it were stationary. This is an example of A. Reflection. B. Refraction. C. Diffraction. D. The Doppler effect.

D. The Doppler effect.

Consider the energy in a pendulum system. Which of the following is TRUE? A. The kinetic energy is constant. B. The total energy changes as the mass moves. C. The potential energy is greater when the mass is at its lowest point than when it is at its highest point. D. The potential energy is zero when the velocity is the greatest.

D. The potential energy is zero when the velocity is the greatest.

A struck drumhead is considered A. a driven system that produces harmonic partials. B. a driven system that produces inharmonic partials. C. a free system that produces harmonic partials. D. a free system that produces inharmonic partials.

D. a free system that produces inharmonic partials.

A transducer is any device which transforms one kind of energy into another. In questions 1-4, identify the input (received) energy and the output (produced or generated) energy for the device specified.Select the type of energy conversion performed by the human voice. A. mechanical to electrical B. acoustical to mechanical C. electrical to acoustical D. nerve (physiological) to acoustical

D. nerve (physiological) to acoustical

Radiation of sound refers to A. the harmful effects of x-rays. B. the bending of sound waves around a corner. C. the sound produced during the radioactive decay of nuclear waste. D. the emission of sound energy.

D. the emission of sound energy.

The principle of superposition is experienced in which of the following situations? A. Listening to a surround sound audio system. B. Creating a standing wave on a string. C. Playing in a string quartet. D. Watching ripples in a pond from two dropped rocks. E. All of the above.

E. All of the above.