How would I go about solving this problem? The half-life of a radioactive substance is 5 days. The substance originally contained 230 grams. How long will it take for the substance to weigh 23 grams?

Question

anonymous · Answer

i just forgot the eq ... but here r some tips ... thru given value of halflife u find the const. then u try the formula

smthng like 


log n/n' one i told u cant remebr equations ....but if u find the const. then u put all those values into the formula in this para

anonymous · Answer

Think it's 0.1 = 0.5^t/5 is 16.6 days approx. http://en.wikipedia.org/wiki/Half_life

anonymous · Answer

15 days + 1.25 of 5 days