The half-life of cesium-137 is 30 years. Suppose we have a 17-g sample.

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FBFHER

Mathematics

Description

(c) How much of the sample will remain after 61 years? (Round your answer to one decimal place.) 

 g 

(d) After how long will only 4 g of the sample remain? (Round your answer to the nearest whole number.) 
t =  yr

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Explanation & Answer

A=17e^(-0.023t), t=17, A=11.5 g

4=17e^(-0.023t), t=8 yr


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