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lecture14 - SOME UNITS Vacuum Wavelength in nm or m 1 =1010...

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Vacuum Wavelength, , in Å , nm or m 1 Å =10 10 m =10 4 m =10 1 nm 10 Å =10 9 m =10 3 m = 1 nm 10 +4 Å =10 6 m = 1 m =10 +3 nm Visible light: 0.4 to 0.65 m Light from HeNe lasers: 0.633 m Optical fiber communications: 1.55 m Frequency, f or , in Hz f=c/ or f =c c=2.9979 10 +8 m/s ~ 3 10 +8 m/s Wave number, WN, in cm 1 No. of wavelengths fitting into 1.00 cm 4 1 10 ] m in [ ] cm in WN [ SOME UNITS
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