onde.py

Created on December 14, 2021
805 Bytes
f=1/T
retard delta t= x/c
onde progressive: P(x,t)= f(t-x/c)
onde sinus: P(x,t)= Acos(+-kx+P)
avec k=w/c
w puls temp 
per temp: T= 2pi/w
per vibra: lam=2pi/k
lam=c/f
vP vit de phase= w/k
interferencesi mm w, sinusoid, sorc ponctuelle
grd vibratoires: s1= S1 cos(wt+P1)
et s2 se somment:
  s(M,t)= s1(m,t)+s2
  S^2=S1^2+S2^2+2S1S2cos(P2-P1)

inter construct si S1 et S2 fixé:
  si P=P2-P1=2ppi
inter dest si P=..=pi+2ppi
vibrat min opp de phase
P=kd=2pi/lam d avec d diff de marche
=r1-r2

formul de fresnel: I(M)=I1+I2+2rac(I1I2)
cos P(M)
si I1=I2=I0:
  I(M)=2I0(1+cosP(M))
d=n(S2M-S1M) n=ind milieux
  
d=nax/D
P=2pinax/lamD
interfranges: i=lam D/ n a
pulsas vois: w2-w1<<w1,w2
forme gene onde stat:
  y(x,t)=f(t)g(x)
  kL=npi
  dc y(x,t)= 2y0n sin(npict/L)
  sin(npix/L)
  f=c/lam= cn/2L