1.

to determine the age of fossil which radioactive element is used

Answer»

Ans :- Carbon-14, the radioactive isotope of carbon used in carbon dating has a half-life of 5730 years, so itdecaystoo fast. It can only be used to date fossils younger than about 75,000 years.Potassium-40 on the other hand has a half like of 1.25 billion years and is common in rocks and minerals.



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