After three half-lives, a sample contains 20 grams of parent isotopes. how many grams of the parent isotope were present to start?
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let there be x grams of isotopes
no. of grams remaining after 1st half lives is equal to 1/2*x
no. of grams remain after second half is 1/4 *x.
no. of grams remaining after 3rd half lives is 1/8*x
now, 1/8*x =20.....given
=>x= 160
no. of grams remaining after 1st half lives is equal to 1/2*x
no. of grams remain after second half is 1/4 *x.
no. of grams remaining after 3rd half lives is 1/8*x
now, 1/8*x =20.....given
=>x= 160
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