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Shkiper50 [21]
3 years ago
15

If a sample has 25% parent and 75% daughter, how many halflifes have gone by?

Chemistry
1 answer:
Anit [1.1K]3 years ago
6 0

Answer:

Two half lives.

Explanation:

It is known that the decay of isotopes and radioactive material obeys first order kinetics.

Also, it is clear that in first order decay the half-life time is independent of the initial concentration.

That means for a sample 100% to decay to 50 % it will take one half-life, and to decay the remaining 50% to 25% it will take another half-life.

So, for a sample has 25% parent and 75% daughter it will have two half-lives.

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