ocr: WAVELENGIH Wavelength, defined for a periodic motion, means the distance during one period. For visible light and UV-radiation, wavelength are usually given in angstroms. (1 A= 0.1 nm. Inm - one billionth of a metre. The wavelength of visible light ranges from 4000 to 7000 A. A human sees the different wavelengths of the light as different colours. Ultraviolet radiation has somewhat shorter wavelengths 100-4000 A). The wavelengths ofX radiation are even shorter (0.1-100 A), and the wavelengths of gamma radiation are below 0.1 A. Infrared radiation ranges from the upper end of visible light up ...
