Translations:Reflection coefficients and transmission coefficients/2/en

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This splitting of the incident wave into a reflected wave and a transmitted wave at the interface is caused by the abrupt change in rock density and/or velocity. For the normal-incidence case that we treat here, the reflected and transmitted waves have the same shape and breadth as did the incident wave, but they differ from it in amplitude. The ratio of the amplitude of the reflected wave to that of the incident wave is termed the reflection coefficient. Similarly, the ratio of the amplitude of the transmitted wave to that of the incident wave is called the transmission coefficient. However, the reflection coefficient defined for a wave in which the amplitude is measured in terms of particle velocity is different from the reflection coefficient for a wave in which amplitude is measured in terms of pressure. The same statement holds for the transmission coefficient. Let us now establish this difference.