simrahali15
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PLEASE QUICKLY. I'll give BRAINLIEST. A sample contains 25% parent isotope and 75% daughter isotopes. If the half-life of the parent isotope is 72 years, how old is the sample?

144 years old
216 years old
288 years old
360 years old

Sagot :

pstnonsonjoku

From the calculations and the principles of radioactivity, the age of the parent isotope is 144 years

What is radioactivity?

The term radioactivity has to do with the spontaneous decay of a substance.

We know that we have about 25% parent isotope still remaining hence;

[tex]0.693/t1/2 =2.303/t log No/N\\When N =0.25 No and t1/2 = 72 years\\0.693/72 =2.303/t log No/0.25No\\0.0096 = 2.303/t *0.60206\\0.0096 = 1.3865/t\\t = 1.3865/0.0096\\t =144 years[/tex]

Learn more about radioisotope:https://brainly.com/question/13076859

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