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Introduction to Stefan Boltzmann law

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Stefan Boltzmann Law

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Stefan's Law

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Important Questions

The temperature of equal masses of three different liquids and are and respectively. The temperature when and are mixed is and when and are mixed it is . What should be the temperature when and are mixed?

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A black body at a temperature of radiates heat energy at the rate . At a temperature of , the rate of heat radiated per unit area in will be:

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A body cools from C to C in minutes. Calculate the time it takes to cool from C to C. The temperature of the surroundings is C.

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A spherical black body with a radius of 12cm radiates 450W power at 500K. If the radius were halved and the temperature doubled, the power radiated in watts would be :

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State Kirchhoff's law of radiation and prove it theoretically.

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Certain quantity of water cools from to in the first minutes and to in the next minutes. The temperature of the surroundings is ;

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The plots of intensity versus wavelength for three black bodies at temperatures  and  respectively are shown in fig. Their temperatures are such that:

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A pan filled with hot food cools from to in minutes. When the room temperature is . How long will it cool from to ?

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Two spheres of the same material have radii and and temperature and respectively. The energy radiated per second by the first sphere is :

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A body cools down from to in Minutes when the temperature of surrounding is . The temperature of the body after next minutes will be:

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