ondes.py

Created on February 07, 2024
893 Bytes
1)Formules de base:
  f=1/T
  
  v=lambda/T  =d/delta t
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2)Son:
  intensite sonore:
    I=P/S
Wm^-2= W / m^2

  niveau sonore:
    L=10log(I/Io)
    dB
    Io= seuil daudibilite
        10^-12 Wm^-2
  I=Io*10^(L/10)
  
I saditionne mais pas L

  attenuation:
    A=L-L"
    A=10log(I/I")
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3)Lumiere:
  E=h*U
      nu en Hz
  E=h*C/lambda
      c=3,0*10^3 ms^-1
      
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4)Diffraction:
  teta=lambda/a
  rad
  
  teta=L/2D
  
  tan=opp/adj
     =L/2D
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5)Interference:
  deltamin=D2-D1
  
constructive:
  deltamin=k*lambda
  
destructive:
  deltamin=(k+1/2)*lambda
  
antifrange:
  i=lambda*D/b
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6)Effet Doppler:
  fr= son recu
  fe= son emis
  
fr=fe*C/C+v ->fr<fe son+Grave

fr=fe*C/C-v ->fr>fe son+Aigue