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Homework Help: The effective radiative temperature

  1. Jan 24, 2010 #1
    1. The problem statement, all variables and given/known data

    It is believed that in the Archeaneon (2.5-4 billion years ago) the sun’s radiative output was 30% less than it is today.

    (i) What would the temperature of the sun have been at that time?

    (ii) At what wavelength would the peak emission from the sun have been?

    (iii) Ignoring the effects of the atmosphere, what would the temperature of the Earth have been at this time (i.e. the effective radiative temperature)? Assume that the Earth’s albedo was 0.3, the same as today.


    2. Relevant equations
    Boltzman equation
    wiens law

    3. The attempt at a solution
    a)T= 4th root[5143824/(5.67*10^-8)]
    t=5488.14K

    b)detlamax=2897/5488.147
    =0.527
     
  2. jcsd
  3. Jan 24, 2010 #2
    i need help with part c? please can some 1 help me ! asap! im desperate! thank you!:)
     
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