ONDES Flashcards

1
Q

Onde

A

Propagation d’une perturbation

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2
Q

Intensité sonore

A

I = I0 x 10^L/10

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3
Q

Niveau sonore

A

L = 10 x log(I/I0)

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4
Q

Atténuation géométrique

A

Avec distance

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5
Q

Atténuation par absorption

A

Matériau interposé

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6
Q

Demi grand angle

A

θ = λ/a
a –> taille de l’obstacle

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7
Q

Interferences constructives

A

δ = k λ

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8
Q

Interférences destructives

A

δ = (k+1/2) λ

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9
Q

Interfrange

A

i = Dλ/b
b –> distance entre les trous
D –> distance écran

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10
Q

Décalage Doppler

A

Δf = fpercue - femis

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11
Q

Source qui s’éloigne

A

Δf = -fe x vs/(ve+vs)

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12
Q

Source qui s’approche

A

Δf = fe x vs/(ve-vs)

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