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The radioactive substance Iridium-192 has a half-life of 73.83 days. How many days would it take for a sample of Iridium-192 to decay to 1% of its original amount? Round your answer to the nearest integer.

 Jul 2, 2022
 #1
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1% ==100%  x  1/2^(d/73.83)

 

0.01 ==1  x  1/2^(d / 73.83)

 

d / 73.83 ==log(0.01) / log(1/2)

 

d / 73.83 == 6.6438561898

 

d ==73.83 x 6.6438561898 ==490.5159==~491 days

 Jul 2, 2022
 #2
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+1

already posted here: https://web2.0calc.com/questions/help_85497

 

 

 

 

-nerdiest.

 Jul 3, 2022

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