Astr 3000 Contemporary Astronomy
Fall 2017 - Assignment 12
due Monday December 4th 2017

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Assignment

  1. Stars A and B are equally bright, but star B is 6 times further away
    1. Which one is dimmer from our point of view?
    2. By how much?
  2. Star C has only half the brightness of star D, and is 3 times further away
    1. Which one is dimmer from our point of view?
    2. By how much?
  3. Star E has five times the brightness of star F, and is 3 times further away
    1. Which one is dimmer from our point of view?
    2. By how much?
  4. Star G is six times the radius of star H, and has a surface temperature twice as high
    1. Which one produces the most amount of light?
    2. By what factor?
  5. Star K is six times the radius of star L, but has a surface temperature only half that of star L
    1. Which one produces the most amount of light?
    2. By what factor?
  6. Compared to star M, star N is three times bigger and eight times further away. The surface temperature of start M is 4000 K, whereas the surface temperature of start N is 5000 K
    1. Which one is dimmer from our point of view?
    2. By how much?

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