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marishachu [46]
3 years ago
8

True or false: all of the rivers in the united states are closely monitered for pollution levels

Chemistry
2 answers:
timofeeve [1]3 years ago
8 0

Answer:It is false!

Explanation:

aleksklad [387]3 years ago
6 0

Answer:

False

Explanation:

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Half life is the amount of time taken by a radioactive material to decay to half of its original value.

Radioactive decay process is a type of process in which a less stable nuclei decomposes to a stable nuclei by releasing some radiations or particles like alpha, beta particles or gamma-radiations. The radioactive decay follows first order kinetics.

Half life is represented by t_{\frac{1}{2}

Half life of Thallium-208 = 3.053 min

Thus after 9 minutes , three half lives will be passed, after ist half life, the activity would be reduced to half of original i.e. \frac{2400}{2}=1200, after second  half life, the activity would be reduced to half of 1200 i.e. \frac{1200}{2}=600,  and after third half life, the activity would be reduced to half of 600 i.e. \frac{600}{2}=300,

Thus the activity 9 minutes later is 300 bq.

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<span>elements</span>

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