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The Physics Hypertextbook © 1998–2013 Glenn Elert |
No condition is permanent.
Sound, for example …
Acoustic impedance, Z = ρv, is important when calculating the amount of reflection and transmission at an interface. For the reflected portion, notice that when Z2 < Z1, the sign of the reflected portion is negative, which indicates a change of phase.
| R/A0 = (Z2 - Z1)/(Z2 + Z1) | (reflected pressure amplitude) | |
| T/A0 = 2Z2/(Z2 + Z1) | (transmitted pressure amplitude) | |
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The Physics Hypertextbook © 1998–2013 Glenn Elert |
No condition is permanent.