§10.6 Photochemistry 6.1 Brief introduction of light 1)Photochemistry The branch of chemistry which deals with the study of chemical reaction initiated by light 2) Energy of photon The photon is quantized energy: light quantum ho Where h is the Plank constant, C the velocity of light in vacuum, a the wave-length of the light, and v the wave number6.1 Brief introduction of light The branch of chemistry which deals with the study of chemical reaction initiated by light. 1) Photochemistry The photon is quantized energy: light quantum     hC C = h = h = Where h is the Plank constant, C the velocity of light in vacuum,  the wave-length of the light, and  the wave number. 2) Energy of photon §10. 6 Photochemistry