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Unformatted text preview: laboratory is observed to be Doppler shifted to a wavelength of 301 nm in the spectrum of a star. a. Is the star moving toward or away from the observer? b. What fraction of the speed of light is this star moving? c. Given that the speed of light is 300,000 km/s, compute the star's speed in km/s. 41) 9 42) A star has an effective surface temperature that is twice that of the sun, but the same diameter. a. In terms of the solar luminosity Lsun, what is the star's luminosity L (i.e. total energy output per unit time)? b. Recalling that the sun has it spectral energy peak at a wavelength of about 500 nm, what would be the wavelength of peak energy of this star? 42) 10...
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 Fall '08
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