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| 1 |  |  Describe a type of experiment that shows that light behaves like a stream of particles and one that shows that light behaves like waves. |
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| 2 |  |  Name a substance that has a reflectivity of nearly 100% and another that has a reflectivity near 0%. |
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| 3 |  |  Draw a diagram showing how a mirror forms an image. |
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| 4 |  |  What are two advantages of using CCDs as opposed to photography? |
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| 5 |  |  List the qualities that astronomers look for when evaluating a possible observing site. |
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| 6 |  |  What are two reasons why astronomers have used space observatories? |
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