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Q 17.4: Two speakers both emit sound of frequency 320 Hz, and are in phase. A receiver sits 2.3 m from one speaker, and 2.9 m from the other. What is the phase difference between the two sounds detected
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Feb 18, 2021
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Q 17.4: Two speakers both emit sound of frequency 320 Hz, and are in phase. A receiver sits 2.3 m from one speaker, and 2.9 m from the other. What is the phase difference between the two sounds detected by the receiver
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Answer:
0.56*λ = 200º
Step-by-step explanation:
In order to know the phase difference between the two sounds detected by the receiver, we need first to know the wavelength of the sound.
Assuming that the sound wave is a plane wave, there exists a fixed relationship between the speed of sound, the frequency and the wavelength, as follows:
Assuming v= 343 m/s, and f = 320 Hz, we can find λ, as follows:
In order to know the phase difference, we need to know the path difference between both sounds, in units of wavelength:
d = 2.9 m - 2.3 m = 0.6 m
So, we can the fraction of the wavelength represented by the distance d, as follows:
As a difference of 1 λ, means that both sounds arrive in phase each other, a difference of 0.56*λ, in degrees, is as follows:
Bmu
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Feb 22, 2021
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