The equivalent wavelength is deduced and defined by considing the influence of ambient radiation, and adopted to simplify the mathematical model of temperature measurement.
考虑了环境辐射影响，基于中值定理推导并定义等效波长，用于简化测温数学模型。
Instead, a single wavelength can be selected to produce the X-ray equivalent of a pure-colour beam of light.
事实上单独某一个波长的射线就可以产生好象一束单色光一样的纯净的伦琴射线。
A decreased frequency is equivalent to a longer, or redder, wavelength. This is gravitational redshift.
较低了的频率，相当于较长或较红的波长，这就是红移。
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