For the following characteristics of optical spectroscopy de
     For the following characteristics of optical spectroscopy, determine if it applies to absorption spectroscopy or luminescence spectroscopy:  small signal on small background  small signal on large background  requires use of two monochromators  limited applicability to species that emit light  requires use of one monochromator  can be used to detect any atom or molecule 
  
  Solution
1. small signal on small background: luminescence
2. small signal on large background: absorption
3. requires use of two monochromators: luminescence
4. limited applicability to species thhat emit light: luminescence
5. requires use of one monochromator: absorption
6. can be used to detect any atom or molecule: absorption

