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Which of these formulas is used to calculate the sound pressure level in dB?
\(L = 10∙log(p^2/(p_0^2 ))\) | \(L = 10∙log(p^2/(p_0^2 )) * 5\) | \(L = 20∙log(p/p_0 )\) | \(L = 20∙ln(p/p_0 )\) |
What is the speed of sound in the air?
340 km/h | 340 km/h | 340 m/s | 1000 km/h |
Which frequency has the longest wavelength ?
Une onde à 30 Hz | Une onde à 300 Hz | Une onde à 3000 Hz |
On which third octave band does the A weighting equal 0 ?
630 Hz | 1000 Hz | 2000 Hz | 6300 Hz |
Considering a spherical wave, how much does the sound pressure level decrease when the distance between the source and the receptor is doubled?
2 dB | 3 dB | 6 dB | 10 dB | 20 dB |
Considering a cylindrical wave, how much does the sound pressure level decrease when the distance between the source and the receptor is doubled?
2 dB | 3 dB | 6 dB | 10 dB | 20 dB |
For sound pressure level measurements, the Fast Time Weighting corresponds to an integration time of:
500 ms | 125 ms | 1 s |
Which of these expressions best characterize the best the octave and third octave filters?
Filtres à Δf constant | Filtres à Δf/f constant |
The A Weighting is most valid for:
Low SPL (~40 dB) | Medium SPL (~60dB) | High SPL (>80 dB) |
How much time is required to regenerate the hair cells in our cochlea ?
1 week | 1 year | 10 year | Never – they do not regenerate |
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