Asample has passed through 6 half-lives, what is the ratio of parent isotopes to daughter isotopes? a. 1 parent isotope for every 6 daughter isotopes b. 6 parent isotopes for every 1 daughter isotopes c. 1 parent isotope for every 64 daughter isotopes d. 1 parent isotope for every 63 daughter isotopes

Option C

Explanation:

After energy half life, a radioactive substance reduces its weight by half

After first half life, weight of the sample would be

After second half life, weight of the sample would be

After third half life, weight of the sample would be

After fourth half life, weight of the sample would be

After fifth half life, weight of the sample would be

After sixth half life, weight of the sample would be

Hence Option C is correct