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.

English, Spanish (CREA), German
Image (53.3 kByte)
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
There are no other media directly related to this file.
Illustration
Physics; Technology
Grade 5 to 6; Grade 7 to 9; Grade 10 to 13
Middle/high school; Vocational training
Chart; Sound; Wave (physics)
Siemens Stiftung Media Portal
MediaHouse GmbH
© Siemens Stiftung 2016
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