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# Solved Example Problems for Laws of Heat Transfer

Prevost theory of heat exchange, Stefan Boltzmann law, Wienâ€™s displacement law

### EXAMPLE 8.9

The power radiated by a black body A is EA and the maximum energy radiated was at the wavelength Î»A. The power radiated by another black body B is EB = N EA and the radiated energy was at the maximum The power radiated by a black body A is EA and the maximum energy radiated was at the wavelength Î»A. The power radiated by another black body B is EB = NEA and the radiated energy was at the maximum wavelength, 1/2 Î»A. What is the value of N?

According to2Wienâ€™s displacement law

Î»max T = constant for both object A and B Object B has emitted at lower wavelength compared to A. So the object B would have emitted more energetic radiation than A.

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11th Physics : UNIT 8 : Heat and Thermodynamics : Solved Example Problems for Laws of Heat Transfer |