The night was very dark. Nevertheless, she saw a figure gazing at her through the window; a lamp lighted up this apparition. 她睁开眼睛,夜晚一片漆黑,这时她看见一张脸孔在窗口望着她,有一盏灯照着那个人影。
So we can figure out the energy of each photon emitted by our UV lamp by saying e is equal to h c over wavelength. 所以我们可以计算出,每个从紫外光源射出的光子,也就是e等于h乘以c除以波长。