Problem

A laboratory investigation shows that a sample of…

01:17

Problem 39 Easy Difficulty

A sample of rock was found to contain 8.23 $\mathrm{mg}$ of rubidium- 87 and 0.47 $\mathrm{mg}$ of strontium- 87
(a) Calculate the age of the rock if the half-life of the decay of rubidium by $\beta$ emission is $4.7 \times 10^{10} \mathrm{y} .$
(b) If some $\frac{87}{38} \mathrm{Sr}$ was initially present in the rock, would the rock be younger, older, or the same age as the age calculated in $(\mathrm{a})$ ? Explain your answer.

Answer

a) 3.8 billion years
b) the rock would be younger than what is calculated.

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Chemistry 102

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Video Transcript

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