They are employed in several photometric procedures . 它們在幾種光度法中獲得作用。
Less critical is the situation in the case of photometric observation . 做光度測量的條件就不那么嚴格了。
The knowledge of this quantity is of importance for photometric measurements . 這個量對于光度測量是很重要的。
Illuminance of illuminating radiation is always measured in photometric units . 照明輻射的照度通常是以光度為單位。
Atomic absorption spectrophotometry is a relatively new method of analysis . 原子吸收分光光度法是一種比較新的分析方法。
The cloud should then have an infrared luminosity thousands of times the sun's bolometric luminosity . 云的紅外光度應為太陽熱光度的幾千倍。
Each line must contain several hundred individually identifiable halftone light values . 每一條線必須包括幾百個各自認得出的用網屏表示的光度值。
Astronomers tacitly assume that stars of the same luminosity and color all have the same mass . 天文學家心照不宣地默認,光度和顏色都相同的恒星具有相同的質量。
As soon as the contracting cloud becomes opaque to its own infrared radiation, its luminosity will drop abruptly . 一旦收縮云變得對它的紅外輻射不透明時,它的光度便要急劇地降低。
Paradoxical as it may seem, the value of a star's luminosity does not depend on the nuclear reactions taking place in the interior . 看來十分奇怪的是,恒星的光度竟然與發生在內部的核反應無關。