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Intensité Sonore-BAC Flashcards

(4 cards)

1
Q

formule intensité sonore I

A

I = P/S
I: W.m^-2
P: puissance (W)
S: surface (m²)

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2
Q

formule niveau d’intensité sonore L

A

L = 10log(I/I0)
L: dB
I: intensité sonore (W.m^-2)
I0 = 1,0
10^-12 W.m^-2: intensité sonore de référence

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3
Q

formule atténuation

A

A= Lsortie - Lentrée
A: atténuation (dB)
Lsortie: niveau d’intensité sonore en sortie du milieu (dB)
Lentrée: niveau d’intensité sonore à l’entrée du milieu (dB)

Atténuation négative

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4
Q

Démonstration calcul Intensité sonore avec L

A

L = 10log(I/I0)
L/10 = log(I/I0)
10^L/10=10^log(I/I0)
10^L/10= I/I0
I= I0
10^L/10

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