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Refer to the text in this chapter if necessary A good score is 18 correct Answers are in the back of the book 1 A young person can hear sounds at frequencies as high as approximately which of the following (a) 20 Hz (b) 20 kHz (c) 20 MHz (d) 20 GHz 2 Electromagnetic interference to a hi-fi amplifier can occur in the presence of (a) a nearby radio broadcast station (b) improperly designed receiving antennas (c) excessive utility voltage (d) improper balance between the left and right channels 3 The midrange audio frequencies (a) are exactly halfway between the lowest and highest audible frequencies (b) represent sounds whose volume levels are not too loud or too soft (c) are above the treble range but below the bass range (d) None of the above are true 4 In the acoustical design of a room intended for a home audio system, (a) the use of small speakers can minimize distortion (b) reflection of sound waves from walls should be minimized (c) the walls should all intersect at perfect 90 angles (d) wooden furniture, without upholstery, should be used

542 Review Questions and Answers Answer 29-8

In hi-fi, an amplifier is usually a self-contained box that delivers medium or high audio power to a set of speakers There is at least one input, but more often there are several: one for a CD player, another for a tape deck, another for a radio tuner, and another for a microphone or turntable Hi-fi amplifiers are available from retail and mail-order houses Input requirements are a few milliwatts; the output can range up to hundreds of watts Prices increase with increasing power output Some amplifiers contain built-in tuners, CD players, or tape decks A simplified hi-fi amplifier forms the basis for a public-address system Massive amplifiers are used by popular music bands Some such systems employ vacuum tubes, because tubes offer electrical ruggedness and linearity

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The common exponential of a number is what we get when we raise 10 to a power equal to that number The natural exponential of a number is what we get when we raise e to a power equal to that number When working with natural exponentials, it s customary to call e the exponential constant

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5 A change of +10 dB in an audio signal represents (a) a doubling of acoustic power (b) a threefold increase in acoustic power (c) a tenfold increase in acoustic power (d) no change in acoustic power, but a change in frequency 6 What is the frequency of an acoustic disturbance whose wavelength is 120 mm in air (a) 279 Hz (b) 279 kHz (c) 358 Hz (d) 358 Hz 7 What is the frequency of a sound wave that propagates at a speed of 1100 ft/s (a) 335 Hz (b) 335 Hz (c) 335 kHz (d) Forget it! The frequency of a sound wave is independent of the propagation speed 8 The relative phase of two acoustic waves from the same source at the same time, one wave direct and one wave reflected from a wall, can affect (a) the positions of antinodes and nodes (b) the perceived frequency (c) the positions of antinodes and nodes, and the perceived frequency (d) neither the positions of the antinodes and nodes, nor the perceived frequency 9 In an acoustic sine wave, (a) the frequency and phase are identical (b) the sound power is inversely proportional to the frequency (c) the sound power is directly proportional to the frequency (d) all of the sound power is concentrated at a single frequency 10 Vinyl disks are (a) susceptible to physical damage (b) useful primarily in high-power sound systems (c) digital media (d) preferred for off-the-air sound recording 11 If an amplifier introduces severe distortion in the waveforms of input signals, then that amplifier is (a) not delivering enough power (b) operating at the wrong frequency (c) operating in a nonlinear fashion (d) being underdriven

Question 29-9

How can we find the number x whose common exponential is 100,000 How can we find the number y whose natural exponential is 100,000

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