A Tiger Moth sitting on a tree emits ultrasound of frequency 20,561 Hz. This frequency is too high for humans to hear. The moth now starts flyingtowards or away from you, while continuing to emit the same sound. Due to the Doppler effect the pitch of the sound arriving at your ear drops to 20kHz and you can just hear it.(a) Is the moth moving towards or away from you? (Note: You only have one try for this multiple choice answer.)moving away from youO moving towards youWhy? (Note: You only have one try for this multiple choice answer.)O moving toward increases the wavelength and decreases the frequencyO moving toward decreases the wavelength and increases the frequencyO moving away increases the wavelength and decreases the frequencyO moving away decreases the wavelength and increases the frequency(b) If the speed of sound is 343 m/s, what is the speed of the moth?m/s

Given, f = 20561 Hz f' = 20 kHz = 20000 Hz Now, from doppler effect, we have the resulting…

A Tiger Moth sitting on a tree emits ultrasound of frequency 20,561 Hz. This frequency is too high for humans to hear. The moth now starts flying towards or away from you, while continuing to emit the same sound. Due to the Doppler effect the pitch of the sound arriving at your ear drops to 20 kHz and you can just hear it. (a) is the moth moving towards or away from you? (Note: You only have one try for this multiple choice answer.) O moving away from you O moving towards you Why? (Note: You only have one try for this multiple choice answer.) O moving toward increases the wavelength and decreases the frequency O moving toward decreases the wavelength and increases the frequency O moving away increases the wavelength and decreases the frequency O moving away decreases the wavelength and increases the frequency (b) If the speed of sound is 343 m/s, what is the speed of the moth? m/s

A Tiger Moth sitting on a tree emits ultrasound of frequency 20,561 Hz. This frequency is too high for humans to hear. The moth now starts flying towards or away from you, while continuing to emit the same sound. Due to the Doppler effect the pitch of the sound arriving at your ear drops to 20 kHz and you can just hear it. (a) is the moth moving towards or away from you? (Note: You only have one try for this multiple choice answer.) O moving away from you O moving towards you Why? (Note: You only have one try for this multiple choice answer.) O moving toward increases the wavelength and decreases the frequency O moving toward decreases the wavelength and increases the frequency O moving away increases the wavelength and decreases the frequency O moving away decreases the wavelength and increases the frequency (b) If the speed of sound is 343 m/s, what is the speed of the moth? m/s

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter13: Mechanical Waves

Section: Chapter Questions

Problem 15OQ: As you travel down the highway in your car, an ambulance approaches you from the rear at a high...

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Female Aedes aegypti mosquitoes emit a buzz at about 4.00102 Hz, whereas male A. aegypti mosquitoes typically emit a buzz at about 6.00102 Hz. As a female mosquito is approaching a stationary male mosquito, is it possible that he mistakes the female for a male because of the Doppler shift of the sound she emits? How fast would the female have to be traveling relative to the male for him to make this mistake? Assume the speed of sound in the air is 343 m/s.
A sound wave in air has a pressure amplitude equal to 4.00 103 Pa. Calculate the displacement amplitude of the wave at a frequency of 10.0 kHz.
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As you travel down the highway in your car, an ambulance approaches you from the rear at a high speed (Fig. OQ13.15) sounding its siren at a frequency of 500 Hz. Which statement is correct? (a) You hear a frequency less than 500 Hz. (b) You hear a frequency equal to 500 Hz. (c) You hear a frequency greater than 500 Hz. (d) You hear a frequency greater than 500 Hz, whereas the ambulance driver hears a frequency lower than 500 Hz. (e) You hear a frequency less than 500 Hz, whereas the ambulance driver hears a frequency of 500 Hz. Figure OQ13.15
On a 20°C°C night, a bat hovering in the air emits an ultrasonic chirp that has a frequency of 45 kHzkHz. It hears an echo 60 msms later. Suppose the object is an insect flying straight away from the bat. What is the insect's speed if the ultrasonic echo is shifted down in frequency by 750 Hz?
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The speed of ultrasound in human body is 1540 m/s. A procedure is performed with a frequency of 2 MHz is used. To monitor the heart rate of a fetus: the maximum speed of a beating heart is 8 cm/s. What is the maximum beat frequency is Hz?
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Suppose a bat emits ultrasound at frequency fbe = 81.28 kHz while flying with velocity vb = (12.16 m/s)i as it chases a moth that flies with velocity vm = (3 m/s)i. What frequency fmd does the moth detect? What frequency fbd does the bat detect in the returning echo from the moth? Assume the speed of sound is 343 m/s. Round all your answers off to two decimal places.
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