Sun radiates thermal radiation with maximum intensity at the wavelength while its surface temperature is . If sun cools down to a temperature where it emits only 81% of its present power, the maximum intensity will then be emitted at wavelength (in micro metre )is equal to
1. When sun cools to the temperature T where it emits only 81% of its present radiating power, then
2. By Wien’s displacement law, constant
Hence if is the required wavelength
Therefore, the correct answer is 0.53
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