wkst_BB - 1 Blackbody Radiation 1 Explain Wiens law in...

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1 Blackbody Radiation 1. Explain Wien’s law in words. Why is it useful? What information do we get out of it? 2. When we look at the light from planets in our solar system, we see a significant amount of radiation at optical wavelengths. However, typical temperatures of planets are 165 K (this is roughly Jupiter’s surface temperature). Is this what you would expect, based on Wien’s law calculations? What other explanation can you think of? 3. Star A is 10 times as luminous as star B, but has only three times its radius. How much hotter
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Unformatted text preview: (by what factor) is it than star B? 4. Assume that lightbulbs act as blackbodies. If bulb X gives off twice as much energy per unit area ( ± = σT 4 ) as bulb Y, but bulb Y has twice the surface area, which has the greater luminosity? 2 5. What are some advantages of having space-based telescopes? Reference a couple different regions of the EM spectrum in your response. 6. How can we increase the light-gathering power of a telescope?...
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  • Fall '10
  • Energy, Black body

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