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How many decibels is a hairdryer producing?

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In one meter distance the hairdryer can be 60 dBSPL.
Never forget to tell the distance of the measuring microphone from the the hairdryer , because the closer you are to the the louder it is.
The sound pressure level decreases by 6 dB per doubling of distance from the source to 1/2 (50 %) of the sound pressure initial value.
The sound pressure decreases inversely as the distance increases with 1/r from the sound source.
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