Transmissivity

Japanese: transmissivity
Transmissivity

… Only a portion of the incident wave is reflected, while the rest is refracted and transmitted through the boundary surface. The ratio of the intensity of the reflected wave to the incident wave is called reflectivity, and the ratio of the intensity of the transmitted wave to the incident wave is called transmissivity. Reflection occurs at places where the propagation of the wave changes rapidly compared to its wavelength, so in the case of microwaves in a waveguide or sound waves in a wind instrument, reflection occurs from the joints of the waveguide, not just at the boundary between different materials. …

*Some of the terminology explanations that mention "transmissivity" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

… 入射波のうち反射されるのはその一部であり,残りは屈折して境界面を透過する。入射波に対する反射波の強度比を反射率reflectivity,入射波に対する透過波の強度比を透過率transmissivityという。反射は波の伝わるようすが波長に比べて急激に変化する場所で起こるので,導波管中のマイクロ波や管楽器中の音波などの場合,異なる物質との境界面でなくとも,導波路の継目から反射が起こる。…

※「transmissivity」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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