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Sahay Sir > Question Answers > NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry Video Solutions > Physics > Chapter 17 - Thermal Properties of Matter > Assuming the sun to have a spherical outer surface of radius r radiating like a black body at temperature t degree C. The power received by a unit surface (normal to the incident rays) at a distance R from the centre of the sun is where sigma is the Stefan’s constant.

Assuming the sun to have a spherical outer surface of radius r radiating like a black body at temperature t degree C. The power received by a unit surface (normal to the incident rays) at a distance R from the centre of the sun is where sigma is the Stefan’s constant.

A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using