photochemical effect वाक्य

उदाहरण वाक्य

1. Wilhelm Homberg described how light darkened some chemicals ( photochemical effect ) in 1694.
2. Alexandre paid special attention to the study of light, investigating the photochemical effects and spectroscopic characters of solar radiation and the electric light, and the phenomena of phosphorescence, particularly as displayed by the sulfides and by compounds of uranium.