Son Et Effet Doppler Flashcards

1
Q

Relations intensité sonore

A

I=P/S = Io x 10^L/10

W•m^-2

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2
Q

Niveau d’intensité sonore

A

10log( I/I.)

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3
Q

Atténuation géométrique

A

A= L proche - L éloignée

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4
Q

Intensité sonore incidente

A

I incident = I absorbée+ I transmise+ I réfléchi

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5
Q

Atténuation pas absorption

A

A= L incident - L transmis

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6
Q

Définition effet Doppler

A

Décalage entre la fréquence de l’onde émise fE et de la fréquence d’une onde reçue fR

Δf = fR – fE

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7
Q

Rapprochement de E et R

A

Tr>Te donc fR>fE donc Δf>0
Son aigu

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8
Q

Éloignement de E et R

A

Tr>Te donc fR<fE donc Δf<0
Son grave

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9
Q

Cas rapprochement de source

A

Δf = fR – fE = fE• v / (Vonde-v)

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