Age of fossil may be found out by determining the ratio of two isotopes of carbon. The isotopes are

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Q: 90 (CDS-I/2012)
Age of fossil may be found out by determining the ratio of two isotopes of carbon. The isotopes are—
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question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,17,15,7,6,17,2

keywords: 

{'isotopes': [0, 0, 3, 6], 'fossil': [0, 0, 2, 0], 'carbon': [1, 0, 4, 5], 'carbon black': [0, 0, 3, 4], 'ratio': [1, 0, 1, 12]}