81. A physics professor demonstrates the Doppler effect by tying INT a 600 Hz sound generator to a 1.0-m-long rope and whirling it around her head in a horizontal circle at 100 rpm. What are the highest and lowest frequencies heard by a student in the class- room? Assume the room temperature is 20°C.

81. A physics professor demonstrates the Doppler effect by tying INT a 600 Hz sound generator to a 1.0-m-long rope and whirling it around her head in a horizontal circle at 100 rpm. What are the highest and lowest frequencies heard by a student in the class- room? Assume the room temperature is 20°C.

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter16: Waves

Section: Chapter Questions

Problem 43P: (a) Seismographs measure the arrival times of earthquakes with a precision of 0.100 s. To get the...

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Concept explainers

Interference of sound

Seiche

A seiche is an oscillating standing wave in a body of water. The term seiche pronounced saysh) can be understood by the sloshing of water back and forth in a swimming pool. The same phenomenon happens on a much larger scale in vast bodies of water including bays and lakes. A seizure can happen in any enclosed or semi-enclosed body of water.

Question

peaker?
b. What sound intensity level would you experience there if
you did not have any protection for your ears?
c. Earplugs you can buy in the drugstore have a noise reduction
rating of 23 decibels. If you are wearing those earplugs but
your friend Phil is not, how far from the speaker should Phil
stand to experience the same loudness as you?
81. A physics professor demonstrates the Doppler effect by tying
INT a 600 Hz sound generator to a 1.0-m-long rope and whirling it
around her head in a horizontal circle at 100 rpm. What are the
highest and lowest frequencies heard by a student in the class-
room? Assume the room temperature is 20°C.
82. When the heart pumps blood into the aorta, the pressure
BIO gradient-the difference between the blood pressure inside
INT the heart and the blood pressure in the artery-is an important
diagnostic measurement. A direct measurement of the pressure
gradient is difficult, but an indirect determination can be made
by inferring the pressure difference from a measurement of
velocity, Blood is essentially at rest in the heart; when it leaves

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