© Department of Physics, University of Guelph.

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1. Calculate the intensity of the radiated energy from a body at 100ºC. Then calculate the net intensity if the surroundings are at 90ºC.

2. Two aluminum spheres are at a temperature of
100ºC in surroundings at 90ºC. The smaller has a surface area of
1 m^{2}. The larger sphere has 8 times the mass of the smaller.
What is the ratio of the initial heat loss of the larger sphere to that of
the smaller?

3. Compare the spectral emittance at a wavelength of 1 micron of objects at 1000 K and 500 K.