Asample of rock is found to contain 200 grams of a parent isotope. how many grams of the parent isotope will remain after one half life

100 grams of sample of parent isotope will be left after the first half life.

Explanation:

Half life of the sample defined as the time taken by the radio active isotope to get reduced to half of its original value present at initial stage.

The initial mass of parent isotope = 200 g

Mass of parent isotope left after the first half life: M

According to definition:

100 grams of sample of parent isotope will be left after the first half life.

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