 Solution

ID: past-exam-of-the-short-options-paper-shared-by-prelims-and-parts-a-and-b-of-the-physics-course-of-the-university-of-oxford/2017/s2/2/1/solution

L = 4 π R_{*}^{2} σ T_{eff}^{4}

L

, photospheric radius

R_{*}

σ

. It is the blackbody temperature giving the same total surface flux, not a claim that each spectral line forms at that temperature.

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