les ondes Flashcards

1
Q

onde

A

perturbation qui se propage avec transfert d’énergie sans transfert de matière

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2
Q

longitudinal

A

perturbation de même direction que le sens de propagation (son, ressort)

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3
Q

transversal

A

perturbation perpendiculaire au sens de propagation (corde, vague, lumière)

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4
Q

f=

A

1/T

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5
Q

lambda =

A

C * T

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6
Q

Onde acoustique

A

onde mécanique longitudinal

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7
Q

I (avec l’unité)

A

intensité sonore (w/m^2)

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8
Q

I =

A

P/S ou P/4pir^2

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9
Q

L (avec unité)

A

Niveau d’intensité sonore (dB)

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10
Q

L =

A

10 log (I/Io)

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11
Q

Io =

A

10^-12 w/m^2

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12
Q

I avec Io =

A

Io * 10^L/10

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13
Q

A (avec l’unité)

A

Atténuation

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14
Q

A =

A

10 log (I’/I)

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15
Q

Tan (angle) =

A

angle = lambda/2/D = lambda/a = l/2d

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16
Q

Interférence constructive

A

sigma = K* lambda (avec K un nombre entier)
en Phase; ondes arrivent dans le même état vibratoire

17
Q

Interférence destructive

A

sigma = (K + 0.5)* lambda (avec K un entier)
en opposition de phase; ondes dans des états vibratoire opposé