- #1
quietrain
- 655
- 2
Homework Statement
temp = 6000k
what is the power radiated by the sun per megacycle bandwidth at a wavelength of 2cm?
Radius of sun = 7 x 10 10 cm
Homework Equations
i was asked to use this equation energy density u = ω2kT dω / (π2c3) NOTE: π is pi. not n
The Attempt at a Solution
but how do i relate the energy density u , from Plancks law, to the power radiated at 2cm wavelength?
i integrated the energy density u and sub in the values but i did not get the answer of 8x109 watts
may i ask what is the energy density u ? how is it related to the power radiated from the sun?
i realize i could not use stephen Boltzmann law to calculate this. why is this so?
thanks!