document.write( "Question 856483: Suppose atoms of a given kind have an exponential distributed lifetime with
\n" ); document.write( "mean 30 years. What is the expected number of atoms still present after 30 years if we start with 10(23) (ten in order twenty-third) atoms?
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Algebra.Com's Answer #516057 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"lambda=1%2F30\"$
\n" ); document.write( " $\"N%28t%29=N%5B0%5D%2Ae%5E%28-%28lambda%2At%29%29\"$
\n" ); document.write( " $\"N%2830%29=1%2A10%5E23%2Ae%5E%28-%28%281%2F30%29%2A%2830%29%29%29\"$
\n" ); document.write( " $\"N%2830%29=1%2A10%5E23%2A%280.3679%29\"$
\n" ); document.write( " $\"N%2830%29=3.679%2A10%5E22\"$
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