The half life of the radioactive substance strontium 90 is 29 years Suppose a sample of rock contains 250 grams of strontium 90 (a) What percentage of strontium 90 decays each year (b) What is the continuous decay rate of strontium 90 (c) How long will it be before the rock sample contains only 6 grams of strontium 90 (d) At one point the sample contained 900 grams of strontium 90 How long ago was that (e) What percentage of the strontium 90 will be left in 900 years

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The half-life of the radioactive substance strontium-90 is 29 years. Suppose a sample of rock contains 250 grams of strontium-90 (a) What percentage of strontium-90

The half-life of the radioactive substance strontium-90 is 29 years. Suppose a sample of rock contains 250 grams of strontium-90

(a) What percentage of strontium-90 decays each year?

(b) What is the continuous decay rate of strontium-90?

(d) At one point the sample contained 900 grams of strontium-90. How long ago was that?

(e) What percentage of the strontium-90 will be left in 900 years?

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