1. Tardigrade
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  3. Biology
  4. Age of fossils in the past was generally determined by radio-carbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary period for different groups of organisms, includes

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Q. Age of fossils in the past was generally determined by radio-carbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary period for different groups of organisms, includes

AIIMSAIIMS 2007

Solution:

Electron Spin Resonance $(ESR)$ measures number of charges occupying deep traps in crystal band gap. The basic principle of $ESR$ is same as those for luminescence ie, electrons become trapped and stored as a result of ionising radiations eg, dating of tooth enamel.