1. How long would it take a radio signal to reach a star that is 9 light years away?
a. nine years, b. you need to know the wavelength, c. you need to know the frequency, or d. you need to know the speed
2. Which type of polarized sunglasses would help reduce glare the best?
horizontally polarized, vertically polarized, or diagonally polarized?
3. An astronomer ovserves the light coming from a distant star. He notices several distinct bright lines in the spectrum. What kind of spectrum is he observing?
absorption, red-shift, emission, polarization, or ultraviolet?
thanks for your help! =)
2007-07-06
20:26:48
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7 answers
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asked by
Jenny V.
2
in
Physics