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Homework Help: IB SL Physics May05/Paper 3

  1. Jun 28, 2007 #1
    In a particular binary star system, star A has apparent brightness 8x10^(-13) and star B has apparent brightness 2x10^ (-14).

    a) Explain how it is possible to deduce that star A has a higher luminosity than star B.

    b) The surface area of star B is 10 000 times smaller than that of Star A. Calculate the ratio
    surface temperature of star B/ surface temperature of star A

  2. jcsd
  3. Jun 28, 2007 #2


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  4. Jun 28, 2007 #3
    a) Because Star A's temperature may be higher and the body my be larger than Star B.

    b) I got no idea how to work it out. I wasn't if i have to find all the unknowns.
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