The visible light---electromagnetic radiation 电磁辐射 The electromagnetic spectrum 电磁波谱 1020 1018 1016 104 1012 1010 10 105 104 Frequency (Hz) UV IR Gamma X rays Ultra- Infrared Microwave Radio waves rays violet Type of radiation L Microwave ovel UHF TV, FM radio. AM 3.0×108m/s police radar. VHF TV V=c/A= =5.75x10-14s-satellite stations cellular radio elephones 522nm×(10-°m/nm) E=hy=6.626×10-34J·s×5.75×1014s1 Emole=A.h-v Photon =6.02×1023×6.626×10-34Js×5.75×104s =3.808×10-20J =2.294×103J=229.4kJ E=h.v 400nm 500 600 700The electromagnetic spectrum The visible light --- electromagnetic radiation 电磁辐射 电磁波谱 UV IR E = ⋅ h ν Photon 34 14 1 20 6.626 10 5.75 10 3.808 10 E h s J s J ν − − − = ⋅ × × × = × = ⋅ 23 34 14 1 5 6.02 10 6.626 10 5.75 10 2.294 10 229.4 Emole J A s kJ s J h ν − − = ⋅ ⋅ = × × × ⋅ × × = × = 8 14 1 9 (1 3.0 10 / 5.75 10 522 0 / ) m s c n m n s m m ν λ − − × − = = = × ×