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  3. a certain element has a half life of 2.52.5 billio

A certain element has a half life of 2.52.5 billion years. a. You find a rock containing a...

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Question

Basic Math

A certain element has a half life of

2.52.5

billion years.

a. You find a rock containing a mixture of the element and lead.You determine that

55?%

of the original element? remains; the other

9595?%

decayed into lead. How old is the?rock?

b. Analysis of another rock shows that it contains

6060?%

of its original? element; the other

4040?%

decayed into lead. How old is the? rock?

Answer & Explanation Solved by verified expert
4.2 Ratings (692 Votes)
The formula for computing the decay in a radioactive substance is Nt N0 ekt or NtN0 ektwhere N0 is the initial quantityNt is the quantity after t years and k is the constant of decay    See Answer
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