## ACOUSTICS

*ACOUSTICS*. Your score is %%SCORE%% sur %%TOTAL%%. Your level is considered as %%RATING%%

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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