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34kurt
3 years ago
13

What does control group mean

Chemistry
1 answer:
fiasKO [112]3 years ago
7 0
A control group is the group in an experiment that does not receive any sort of change, to then be compared to the other treated objects at the end of the study.
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A sample of radioactive waste has a half-live of 40 years and an activity level of 4 curies. After how many years will the activ
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After 160 years, the activity level of the sample will be 0.5 curies.

<h3>What is half-life?</h3>

Half life of any radioactive waste is the half decay of that product.

The formula is \dfrac{\lambda }{\lambda_1} = 2^\dfrac{a}{b}

Where, λ is 4 cruies

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Putting the values in the equation

\dfrac{4}{0.5} = 2^\dfrac{a}{40}\\\\\\\dfrac{a}{40} =  4\\ = 160 years

Thus, the correct option is 160 years.

Learn more about half-life

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