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Chapter 12: Q15-Q (page 328)

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

Short Answer

Expert verified

There is no Doppler shift if the source and observer move in the same direction with the same velocity.

Step by step solution

01

Understanding Doppler Effect

When a sound source is moving toward an observer, the pitch that the observer hears is higher than when the source is at rest. And when the source is traveling away from the observer, the pitch is lower. This phenomenon is known as the Doppler Effect, and it occurs for all types of waves.

02

Understanding Doppler shift

Doppler Shift is caused by relative motion between source and observer, and if both source and observer move in the same direction with the same velocity, there is no relative motion. Hence, no Doppler shift occurs.

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Most popular questions from this chapter

Question: (II) Approximately what are the intensities of the first two overtones of a violin compared to the fundamental? How many decibels softer than the fundamental are the first and second overtones? (See Fig. 12–15.)

Question: (II) (a) Determine the length of an open organ pipe that emits middle C (262 Hz) when the temperature is 18°C. (b) What are the wavelength and frequency of the fundamental standing wave in the tube? (c) What are \(\lambda \)and f in the traveling sound wave produced in the outside air?

Question: (III) When a player’s finger presses a guitar string down onto a fret, the length of the vibrating portion of the string is shortened, thereby increasing the string’s fundamental frequency (see Fig. 12–36). The string’s tension and mass per unit length remain unchanged. If the unfingered length of the string is l= 75.0 cm, determine the positions x of the first six frets, if each fret raises the pitch of the fundamental by one musical note compared to the neighboring fret. On the equally tempered chromatic scale, the ratio of frequencies of neighboring notes is 21/12.

Figure 12-36

Question: (II) What is the beat frequency if middle C (262 Hz) and C# (277 Hz) are played together? What if each is played two octaves lower (each frequency reduced by a factor of 4)?

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.
See all solutions

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