The intensity of solar radiation is maximum at a wavelength of 0.49 μm. Assuming the Sun as a black body, what is the approximate total emissive power of the Sun? [Consider Wien's displacement constant = 2890 μm-K]

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  1. 6.86W/m2
  2. 6.86kW/m2

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Option 1 :
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Concept:

Using Stefan–Boltzmann Law for a black body:

To find temperature, apply Wien's Law:

Now calculate:

 

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