Guided Notes. (Make your own summary) 4. (cont) 1. b) how each appears (what it looks like) a) List the 7 "types" of EM radiation in order of increasing frequency. b) Although we commonly recognise these as 7 5. different radiations, they are really all the same. How can the spectrum of a star be used to find: Explain this statement. a) its surface temperature? 2. Outline Maxwell's contribution to our understanding of EMR. b) its chemical composition? 3. Describe the general method by which all EM waves are produced. c) its movement towards or away from Earth? d) its rotational motion? 4. Explain the difference between an emission spectrum & an absorption spectrum in terms of: a) how each is formed. e) its density