first radiation constant

例句：

1. 1.The first radiation constant is the value of the photoelectric effect at the surface of a material.
   首次辐射常数是材料表面光电效应的值。
2. 2. The first radiation constant determines the intensity of light that can be absorbed by a material.
   首次辐射常数决定了材料可以吸收的光的强度。
3. 3.The first radiation constant is essential for understanding the behavior of matter under high-energy radiation.
   首次辐射常数对于理解物质在高能辐射下的行为至关重要。