homework 05

# Modern Physics

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PHY251 Homework Set 5 Reading: Chapter 4 and 5 Homework: Chapter 4, Questions 2,4 Problems 4,5,7 Chapter 5, Problems 2,22 Hints and Solutions Question IV.2 If you peer through a small hole in a very hot oven, you see a glow that clearly suggests the presence of light waves. This is the blackbody radiation in the oven. If you peer through a hole in a freezer, will there be blackbody radiation inside? What if anything, distinguishes this radiation from the radiation you see in the oven? Hints: No hints Solution: No Solution yet Question IV.4 If Earth were only half its actual distance from the Sun, would the average temperature of Earth change? If so, by about what factor? State the assumptions you must make to be able to give a rough estimate of the factor. Hints: No hints Solution: No Solution yet Problem IV.4 The quantity hc occurs frequently in calculations in quantum mechanics, Express this quantity in MeV·fm. (1 fermi = 1 fm is 10 -15 m. It is a happy coincidence that "fm" can stand both for

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