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All elements have a unique atomic emission spectrum. In which of the following scenarios would this fact be most useful? A. when trying to determine a star's chemical composition B. when trying to determine
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All elements have a unique atomic emission spectrum. In which of the following scenarios would this fact be most useful?

A. when trying to determine a star's chemical composition
B. when trying to determine how old an artifact is
C. when trying to measure the speed of sound

User Vartika
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Optrion A: when trying to determine a star's chemical composition.

Because unique atomic emission spectrum, analyzing the emission spectrum you can tell the chemical composition.
User JPro
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