Sound field and sound absorption © Siemens Stiftung 2016 CC BY-SA 4.0 international

Sound field and sound absorption

Image

Schematic diagram:
Concentric propagation of sound waves. The lines of the same loudness are shown which decreases as the distance to the sound source increases.

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2018-02-01
Why do we hear less the further away we are from the source of sound?
Sound propagates from its source in a circular way, the sound energy spreads over an increasingly large area and the sound pressure decreases accordingly.
In a free sound field it decreases by about 6 dB every time the distance to source is doubled. Within a room, however, this only applies very close to the sound source.

Information and ideas:
Useful for discussing why we hear less the further away the sound source is.

Relevant for teaching:
Sound/acoustics: parameters
Vibrations and waves
Communication and understanding
Illustration
Physics; Technology
Grade 5 to 6; Grade 7 to 9; Grade 10 to 13
Middle/high school; Vocational training
Chart; Sound; Wave (physics)
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© Siemens Stiftung 2016
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