SOLUTION: If 18g of a radioactive substance are present initially and 5 yr later only 9 g remain, how much of the substance will be present after 11yr ?
after 11yr there will be ___g of a r
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Question 928743: If 18g of a radioactive substance are present initially and 5 yr later only 9 g remain, how much of the substance will be present after 11yr ?
after 11yr there will be ___g of a radioactive substance.
round the final answer to the nearest thousandth as needed. round all intermediate values to the nearest thousandth as needed.
Answer by josgarithmetic(39625) (Show Source): You can put this solution on YOUR website!
Decay equation and you first want to take the given data and use to find k. t is time in years, p is quantity remaining after time t.
Substitute the given data point:
, and you can compute this value yourself of k.
How much is p at t=11?
You know k now, and given t.
Evaluate p.
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