Question
Asked Dec 7, 2019
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The acoustical system shown in the figure below is driven by a speaker emitting sound of frequency 730 Hz. (Use v = 343 m/s.)

If constructive interference occurs at a particular instant, by what minimum amount should the path length in the upper U-shaped tube be increased so that destructive interference occurs instead?
m

(b) What minimum increase in the original length of the upper tube will again result in constructive interference?

Sliding section
Receiver
Speaker
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Sliding section Receiver Speaker

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Expert Answer

Step 1

Given,

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Frequency f =730 Hz Velocity of sound wave v = 343 m/s

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Step 2

Wavelength of sound wave;

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v = f 2 2 = - 343 2= 730 2= 0.4698 m

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Step 3

Part (a): Destructive...

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Ar = 4 0.4698 = 0.117 m

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