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UCCS PES 1060 Astronomy II Spring/Fall Chapter 4 Please copy and answer/define the following questions on a separate sheet of paper. Handwrite your answers and use references for your answers. 1. What is the absorption spectrum? 2. What is the emission spectrum? 3. What is spectroscopy? 4. How can spectroscopy be used to infer the composition and temperature of a star? 5. Why are gamma rays generally harmful to life forms, but radio waves generally harmless? 6. What does it mean to say that a physical quantity is quantized? 7. Why do we think light is quantized? 8. Why do excited atoms absorb and reemit radiation at characteristic frequencies?