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Chapter 12: Q3MCQ (page 328)

The sound level near a noisy air conditioner is 70 dB. If two such units operate side by side, the sound level near them would be

(a) 70 dB.

(b) 73 dB.

(c) 105 dB.

(d) 140 dB.

Short Answer

Expert verified

The correct option is (b).

Step by step solution

01

Understanding sound level

Sound level refers to various logarithmic measurements of audible vibrations and may refer to sound exposure level, the measure of the sound exposure relative to a reference value. It is measured in decibels (dB), named in honor of Alexander Graham Bell, the inventor of both the telephone and the audiometer. Sound level is measured by an instrument called a decibel meter.

02

Explanation

A common misconception is to treat the sound intensity level as a linear scale instead of a logarithmic scale. If the sound intensity doubles, the intensity level increases by about 3 dB, so the correct answer is 73 dB.

Hence, the correct option is (b).

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Most popular questions from this chapter

A guitar player shortens the length of a guitar鈥檚 vibrating string by pressing the string straight down onto a fret. The guitar then emits a higher-pitched note because

(a) the string鈥檚 tension has been dramatically increased.

(b) the string can vibrate with a much larger amplitude.

(c) the string vibrates at a higher frequency.

(III) A source emits sound of wavelengths 2.54 m and 2.72 m in air. (a) How many beats per second will be heard? (Assume\(T = 20^\circ {\rm{C}}\)) (b) How far apart in space are the regions of maximum intensity?

Figure 12鈥�32 shows various positions of a child on a swing moving toward a person on the ground who is blowing a whistle. At which position, A through E, will the child hear the highest frequency for the sound of the whistle? Explain your reasoning.

Is there a Doppler shift if the source and observer move in the same direction, with the same velocity? Explain.

A musical note that is two octaves higher than a second note

(a) has twice the frequency of the second note.

(b) has four times the frequency of the second note.

(c) has twice the amplitude of the second note.

(d) is 3 dB louder than the second note.

(e) None of the above.
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