Sound vs Distance: Why Do We Hear It Better Closer?

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SUMMARY

The discussion centers on the relationship between sound intensity and distance from the source. It is established that as distance increases, the intensity of sound decreases due to the spreading of acoustic power over a larger area. The frequency of the sound remains unchanged regardless of distance. This phenomenon explains why sounds, such as a car siren, are perceived as louder when closer to the source.

PREREQUISITES
  • Understanding of sound intensity and its measurement
  • Basic knowledge of acoustic power and its distribution
  • Familiarity with the concept of frequency in sound waves
  • Awareness of the inverse square law in physics
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  • Research the inverse square law and its application to sound propagation
  • Explore the relationship between sound intensity and distance in various environments
  • Learn about sound wave frequency and its effects on perception
  • Investigate acoustic power measurement techniques
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Acoustics students, audio engineers, sound designers, and anyone interested in understanding sound perception and its physical properties.

BH Wiz
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Hello Everyone,
I have a somewhat simple question:
Why do we hear a sound better when we're closer to the object making it?Or less when we're farther? (ie a car siren is disturbingly loud when standing next to the engine but not the same when standing like 10 feet away).
Could it be because the farther you are, the lower the frequency? or it's not about that at all?
Please excuse my English as well as my ignorance about the matter.
Thank you in advance. :smile:
 
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The distance does not affect the frequency. When you increase the distance from the sound source, the intensity is dropping. Intensity is power per unit area. When you are farther away, the acousting power from the source is spread over larger surface (sphere with the radius equal to your distance from the source). The acoustic power of the source is the same, but in greater distance you receive less of that power.
 
I see! Thanks Plate. :smile:
 

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