3.91014 7.810-7 2 light narrow band. White light mixture of all colours of visible spectrum. TV (red blue green). If a an uranium atom 7.71014 enlarged to a size of a pea , red ~ 20 3.910-7 3 m long. Sunlight ~ 1017 photons.s-1.m-2. Blue light photons sufficient energy to disrupt chemical bonds. Inner & outer electrons. (4 Ionising eV photons break C-C bonds). Skin 810-14 410-7 3 ultraviolet cancers, tans the skin, vitamin D synthesis, damage to eyes. O3 layer 31016 110-8 1102 absorbs UV protection layer. Can – kill micro-organisms. Inner electrons, x-ray tubes. Diagnostic medical-rays. Computed 31016 110-8 1102 x-rays tomography CT scan. Crystal & molecular structures. 1020 310-12 4105 Nuclei, accelerators. Sterlisation, food preservation, cancer treatment, > 1018 310-10 > 4103 -rays medical diagnosis, flaw detection. Very penetrating can pass through – large thickness of concrete. MODELS FOR LIGHT Wave model speed of light = 3.0108 m.s-1 c = f c Thomas Young & Augustin Fresnel emr waves - diffraction & interference of light
light 3.91014 7.71014 7.810-7 3.910-7 2 3 narrow band. White light mixture of all colours of visible spectrum. TV (red blue green). If a an uranium atom enlarged to a size of a pea , red ~ 20 m long. Sunlight ~ 1017 photons.s-1.m-2. Blue light photons sufficient energy to disrupt chemical bonds. ultraviolet 810-14 31016 410-7 110-8 3 1102 Inner & outer electrons. Ionising (4 eV photons break C-C bonds). Skin cancers, tans the skin, vitamin D synthesis, damage to eyes. O3 layer absorbs UV – protection layer. Can kill micro-organisms. x-rays 31016 1020 110-8 310-12 1102 4105 Inner electrons, x-ray tubes. Diagnostic medical-rays. Computed tomography CT scan. Crystal & molecular structures. -rays > 1018 310-10 > 4103 Nuclei, accelerators. Sterlisation, food preservation, cancer treatment, medical diagnosis, flaw detection. Very penetrating – can pass through large thickness of concrete. MODELS FOR LIGHT Wave model c = f speed of light c = 3.0108 m.s-1 Thomas Young & Augustin Fresnel emr waves - diffraction & interference of light