39tell me is it from rarer to denser or denser to rarer?
a plane wave y=A sin ω[t-x/v] undergo a normal incidence on a plane boundary separating medium M1 n m2 and splits into a reflected n transmitted wave having speed v1 and .comment on phase of transmitted n reflected wave ,ll they depend on v1 nv2
-
UP 0 DOWN 0 0 9
9 Answers
39in general velocity does not change in reflecttion, only changes in transmission.
phase diff =o if from rarer to denser and Î if from denser to rarer.
33If velocity in second medium is less than first medium then phase change of pi takes place...
1ans given is fr all v1 nv2 phase of trnsmitted wave is same bt reflected wave depend on v1 n v2
39YES U R RIGHT RICHA, AND SORRY I FORGOT TO MENTION IN POST #3, I WAS TALKING ABOUT REFLECTED WAVES.
33if yi is incident wave and yt and yr are transmitted and reflected wave then...
at x=0(boundary of medium) yt=yi+yr
also (d(yi+yr)/dx)x=0=(d(yt)/dt)x=0... slope of wave must be same at junction...
solving these...
33Ar=Ai(v2-v1)/v2+v1
At=Ai(2v2)/v2+v1
clearly any v2 v1 can't make transmitted ray's amplitude negative so no phase change for transmitted...
But if v2<v1 then Ar becomes negative so pi phase change.
Ar is amplitude of reflected wave.. Ai of incident and At of transmitted..