Physique-Chimie TPVP1 2025-2026

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Cours de Physique-Chimie TPVP1

2025-2026

Accueil
Mecanique 1
Mécanique 2
Mécanique 3
Electricité
Acoustique
Chimie 1

Propriété n°1

L'échelle du niveau d'intensité acoustique est particulière, lorsque la puissance sonore P, en W, est doublée, le niveau d'intensité acoustique L augmente de 3 dB . Il s'agit d'une échelle logarithmique et non linéaire.

Acoustique 2 - Niveau d'intensité acoustique - Atténuation

Acoustique 2 : Rappel : Période et fréquence d'un son

Acoustique 1 : Caractériser la propagation du son

Propriété 2

Une onde sonore s'atténue en se propageant et en se diffusant, ainsi lorsque la distance est doublée, la surface de diffusion est multipliée par 4 et le niveau d'intensité acoustique L diminue de 6 dB.

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