Frequency of sound detected by microphone

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SUMMARY

The discussion centers on the calculation of sound frequency detected by a microphone, specifically addressing a discrepancy in the expected frequency of 20 Hz versus the calculated frequency of 10 Hz. The wavelength of sound was determined to be 0.3 meters using the formula 330/1100. The participants suggest that the misunderstanding may stem from the lack of a visual representation, such as a diagram of the sound wave propagation between two speakers, which could clarify the intensity variations and peak locations of the sound waves.

PREREQUISITES
  • Understanding of sound wave properties, including wavelength and frequency.
  • Basic knowledge of sound intensity and its variation over distance.
  • Familiarity with the speed of sound in air (approximately 330 m/s).
  • Ability to interpret and create diagrams representing sound wave propagation.
NEXT STEPS
  • Research the principles of sound wave interference and how it affects intensity.
  • Learn about the relationship between frequency, wavelength, and speed of sound.
  • Explore how to create diagrams to visualize sound wave propagation between sources.
  • Investigate the effects of distance on sound intensity and frequency perception.
USEFUL FOR

Acoustics students, audio engineers, and anyone interested in understanding sound wave behavior and frequency analysis.

desmond iking
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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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