Exam-style question
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What is the primary method by which absorption spectra identify elements in stars?.
- A.By measuring the temperature of the star
- B.By analyzing the wavelengths of light absorbed
- C.By observing the star's luminosity
- D.By calculating the distance to the star
Model answer
What a good answer should say
- By analyzing the wavelengths of light absorbed
Explanation
Why this works
Absorption spectra identify elements in stars by analyzing the specific wavelengths of light that are absorbed by the elements present in the star's atmosphere. Each element has a unique absorption pattern, allowing astronomers to determine its composition.
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