Transmission Coefficient

T = 1 - R = \frac{4 v _{1} v _{2}}{( v _{1} + v _{2} ) ^{2}}

Fraction of wave power transmitted through boundary between two media.

Variables

Transmission coefficient

Fraction of power transmitted (0-1)

unitless

Reflection coefficient

Fraction reflected

unitless

v₁

Wave speed in medium 1

Incident medium

m/s

v₂

Wave speed in medium 2

Transmitted medium

m/s

Energy conservation: T + R = 1. T = 4v₁v₂/(v₁+v₂)².

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