Answered: an airfilled, acoustic interferometer,…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

an airfilled,
acoustic interferometer, used
to demonstrate the interference of
sound waves. Sound source S is an
oscillating diaphragm; D is a sound
detector, such as the ear or a microphone.
Path SBD can be varied in
length, but path SAD is fixed. At D,
the sound wave coming along path
SBD interferes with that coming along path SAD. In one demonstration,
the sound intensity at D has a minimum value of
100 units at one position of the movable arm and continuously
climbs to a maximum value of 900 units when that arm is shifted
by 1.65 cm. Find (a) the frequency of the sound emitted by the
source and (b) the ratio of the amplitude at D of the SAD wave
to that of the SBD wave. (c) How can it happen that these waves
have different amplitudes, considering that they originate at the
same source?

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