Frequency of sound detected by microphone

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The discussion centers on calculating sound frequency and intensity variations detected by a microphone. The initial calculation of sound wavelength is correct at 0.3m, but the derived frequency of 10Hz is questioned, as the expected answer is 20Hz. Participants suggest that the misunderstanding may stem from not visualizing the sound wave interactions, particularly between two speakers. A diagram illustrating the setup could clarify the peaks and intensity variations along the line between the speakers. Overall, visual aids are recommended to better understand the sound dynamics involved.
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first, i find the wavelength of sound = 330/1100= 0.3m

then, I find the frequency of rise and fall of intensuty of sound = 3/0.3 = 10hz..
but the ans is 20hz. which part is wrong?
 

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How does the intensity of the sound vary along the line between X and Y? Where are the peaks?
 
desmond iking said:
first, i find the wavelength of sound = 330/1100= 0.3m

then, I find the frequency of rise and fall of intensuty of sound = 3/0.3 = 10hz..
but the ans is 20hz. which part is wrong?
I reckon the part that's wrong might be right near the start, when you told yourself that this is too straight-forward to bother sketching any diagram. :wink:

How about drawing the two speakers and what you're expecting to find between them?
 

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