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| 1982年CUSPEA试题(二)(英文) | |
| 摘 要： | MODERN PHYSICS(4 hours)Solve 5 of the following 6 problemsB1Our universe is filled with black body radiation (photons) at a temperature T≈3.K. This isthought to be a relic of early developments following the "big bang".(i) Express the photon number density n analytically in terms of T and universal constants. Youranswer should explicitly show the dependence on T and on universal constants. However, a certainnumerical cofactor may be left in the form of a dimensionless integral which n… |
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