|Jul14-12, 02:44 PM||#1|
Height And Width of Reflected Pulses (through less dense medium) ?
1. The problem statement, all variables and given/known data
Consider the waveform shown below heading towards a boundary between two
strings. Let string 1 have mass per unit length of µ1 = 0.05 kg/m and let string 2
have a mass per unit length µ2 = 0.02 kg/m. Let the tension in both strings be T
____/\____ _ _ _ _ _ _ _
string 1 ... string 2
Using the reflection and transmission coefficients, sketch the reflected and
transmitted pulses after the incident pulse has completely passed through the
boundary. How do the width and height of the reflected and transmitted pulses
compare to the incident pulse?
2. Relevant equations
(Ar + Ai) * cos(wt) = At * cos(wt)
Ai + Ar = At
k(1) * (Ar - At) = -k(2) * Atr
3. The attempt at a solution
r = (v(2) - v(1)) / (v(2) + v(1))
τ = 2*v(1) / (v(1) + v(2)) = 2 / (1 + v(1) / v(2))
v(2) = sqrt( (f * τ) / µ2 ) & vise versa
v(1) / v(2) = sqrt( µ2 /µ1 )
r = (1-0.63)/(1+0.63) = 0.225, t= 1.225
I know the pulse in the lighter string should look like ___ _ /\ _ _ (taller but less wide)
But how do I quantitatively illustrate that the width and height change, and by how much?
Help is definitely appreciaTed!
|physics 2, reflection, transmission, waves|
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