Exam-style question
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What role do absorption lines play in the study of stellar atmospheres?.
- A.They indicate the star's distance from Earth
- B.They help determine the star's mass
- C.They provide evidence of chemical elements in the star
- D.They measure the star's brightness
Model answer
What a good answer should say
- They provide evidence of chemical elements in the star
Explanation
Why this works
Absorption lines in a star's spectrum provide direct evidence of the chemical elements present in its atmosphere. Each element absorbs light at specific wavelengths, creating a unique pattern that can be analyzed.
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