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Chapter 17: Q13CQ (page 628)

Elephants and whales are known to use infrasound to communicate over very large distances. What are the advantages of infrasound for long distance communication?

Short Answer

Expert verified

The advantage of infrasound is low loss of the energy.

Step by step solution

01

The range of hearing

The frequency range of the normal human’s ear is from 20 Hz to 20000 Hz. The sound with frequency less than 20 Hz are the infrasonic sounds.

02

Explanation

The infrasound waves have a low frequency which means they possess a large wavelength. The large wavelengths deviate less and does not get absorbed easily, which is important for long-distance communication and low energy loss. The infrasonic sounds are below the audible range, so normal humans cannot hear it.

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Most popular questions from this chapter

The factor of \({\rm{1}}{{\rm{0}}^{{\rm{ - 12}}}}\)in the range of intensities to which the ear can respond, from threshold to that causing damage after brief exposure, is truly remarkable. If you could measure distances over the same range with a single instrument and the smallest distance you could measure was\(1\;{\rm{mm}}\), what would the largest be?

Ultrasound reflected from an oncoming bloodstream that is moving at30.0 cm/sis mixed with the original frequency of\({\bf{2}}.{\bf{50}}{\rm{ }}{\bf{MHz}}\)to produce beats. What is the beat frequency? (Assume that the frequency of\({\bf{2}}.{\bf{50}}{\rm{ }}{\bf{MHz}}\)is accurate to seven significant figures.)

Loudspeakers can produce intense sounds with surprisingly small energy input in spite of their low efficiencies. Calculate the power input needed to produce a\(90.0\;{\rm{dB}}\)sound intensity level for a\({\rm{12}}{\rm{.0}}\;{\rm{cm}}\)diameter speaker that has an efficiency of\(1.00\% \). (This value is the sound intensity level right at the speaker.)

A community is concerned about a plan to bring train service to their downtown from the town’s outskirts. The current sound intensity level, even though the rail yard is blocks away, is 70 dB downtown. The mayor assures the public that there will be a difference of only 30 dB in sound in the downtown area. Should the townspeople be concerned? Why?

How does an unamplified guitar produce sounds so much more intense than those of a plucked string held taut by a simple stick?
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