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.

a. the production of carbon dioxide through the process of photosynthesis

the dark variety, as they are not visible on the dark tree barks

explanation: