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?

Answer : The parent isotope remain after one half life will be, 100 grams.

Explanation : Given,

Initial mass of the isotope = 200 g

Time taken by the sample, t =

Formula used :

where,

= initial mass of isotope

N = mass of the parent isotope left after the time, (t)

= half life of the isotope

= rate constant

Now put all the given values in this formula, we get

Therefore, the parent isotope remain after one half life will be, 100 grams.

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