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emmainna [20.7K]
3 years ago
11

A parent isotope has a half life of 1 million years. If a rock contained 20 mg of the parent isotope when it formed, how much pa

rent isotope would be left after 2 million years?
Biology
2 answers:
rosijanka [135]3 years ago
8 0
5 mg 20/2/2, hence half life
Gwar [14]3 years ago
3 0

Answer:

5 mg parent isotope would be left after 2 million years

Explanation:

It is given that half life of parent isotope is equal to one million years.

Half life period indicates the number of years required by an isotope to reduce its quantity by half.

Amount of parent isotope left after first half life period i,e after 1 million years

= \frac{20}{2} \\= 10mg

Amount of parent isotope left after second half life period i,e after 2 million years

= \frac{10}{2} \\= 5mg

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