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MCQAdvancedStars & Stellar Evolution
USAAAO — 2021 First Round
Question 12
The spectral line Hα in the spectrum of a star is recorded as having displacement of ∆λ = 0.043 × 10^-10 m. At rest, the spectral line has a wavelength of λ0 = 6.563 × 10^-7 m. Calculate the period of rotation for this star, if it is observed from its equatorial plane. We also know: Rstar = 8 × 10^5 km.
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Source
USAAAO 2021 First Round. Question text, choices, and answer were transcribed from the official USAAAO exam and solutions PDFs.