Continuous and Discontinuous Spectra连续和不连续的光谱.ppt

Continuous and Discontinuous Spectra Spectrum = picture of light Spectra = plural of spectrum Light diffraction produces a spectrum Each element has a characteristic spectrum Diffraction gives information about atom structure Continuous and Discontinuous Spectra White light gives a continuous spectrum of all colors Continuous and Discontinuous Spectra With elements as the light source “line spectra” are produced Continuous and Discontinuous Spectra With elements as the light source “line spectra” are produced Some Uses for Spectra Using a spectroscope, scientists can identify the elements that make up distant stars Scientists can identify molecules here on earth Explanation of the line spectrum of hydrogen gives us the “Bohr Model of the Atom,” where electrons circle the nucleus in orbits. * * Prism or Diffraction Grating WHITE Light Continuous Spectrum (Rainbow) Prism or Diffraction Grating HYDROGEN Source Dis-Continuous Spectrum (4 Lines Only!) Excited Prism or Diffraction Grating SODIUM Source Dis-Continuous Spectrum (2 Lines Only!) Excited