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Chapter 17: Q5CQ (page 628)

Is the Doppler shift real or just a sensory illusion?

Short Answer

Expert verified

Doppler effect is not an illusion it is a real phenomenon.

Step by step solution

01

Ambulance example

We can imagine of ambulance approaching near us. By listening to its horn we can experience the shift when it comes closer and when it goes far from us.

02

Explanation of ambulance example using doppler effect

It happens when the ambulance comes near us frequency of sound as heard by the observer(us) increases and when it goes far away, the frequency of sound as heard by the observer(us) decreases.and this effect is known as doppler effect. Thus it is not an illusion.

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Most popular questions from this chapter

(a) What are the loudnesses in phons of sounds having frequencies of \({\rm{200 Hz}}\), \({\rm{1000 Hz}}\), \({\rm{5000 Hz}}\), and \({\rm{10,000 Hz}}\) if they are all at the same \({\rm{60}}{\rm{.0 - dB}}\) sound intensity level? (b) If they are all at \({\rm{110 dB}}\)? (c) If they are all at \({\rm{20}}{\rm{.0 dB}}\)?

What frequency is received by a mouse just before being dispatched by a hawk flying at it at \(25.0\;{\rm{m/s}}\)and emitting a screech of frequency\({\rm{3500}}\;{\rm{Hz}}\)? Take the speed of sound to be\(331\;{\rm{m/s}}\).

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?

a) How much more intense is a sound that has a level \(17.0\;{\rm{dB}}\)higher than another? (b) If one sound has a level \(23.0\;{\rm{dB}}\) less than another, what is the ratio of their intensities?

(a) Find the length of an organ pipe closed at one end that produces a fundamental frequency of 256 Hz when air temperature is18.0C. (b)What is its fundamental frequency at 25.0 C?
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