What fraction of a given sample of radioactive nuclide remains after four half lives?

2 answers:

7 0

1 half-life: 1/2 left

2: half of that, or 1/4

3: half of that, or 1/8

4: half of that, or 1/16

. (1/2)^4 = 1/16
soafter four half lives it would be 1/16
so correct option is D

Black_prince [1.1K]3 years ago

5 0

I believe the answer is D. 1/16.

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Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

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In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 99% of confidence, our significance level would be given by $\alpha=1-0.99=0.01$ and $\alpha/2 =0.005$ . And the critical value would be given by: