17.2 (a) Use the fact that fo [2³/(e² − 1)] dz = π¹/15 to showthat the total radiant energy emitted per second by unit area of ablackbody is 27³KT4/15c²h³. Note that this quantity is propor-tional to T4 (Stefan's law). (b) The sun's diameter is 1.4 × 10⁹ mand its effective surface temperature is 5800 K. Assume the sunis a blackbody and estimate the rate of energy loss by radiationfrom the sun. (c) Use E mc² to calculate the relativistic massof the photons lost by radiation from the sun in 1 year.=

The total radiant energy emitted per unit area by a blackbody is given by the Stefan-Boltzmann law:…

Answered: 17.2 (a) Use the fact that f [2³/(e² -…

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