Question

The half life radioactive isotope x is 20 years .it belongs to another element y which is stable.the two elements x and y were found to be in the ratio 1 to 7 in a sample of given rock.find out the age of the rock.​

Answer 1

Answer: 60 years

Explanation: ratio =1:7 (1+7)

X= 1/8 and y =7/8

1/8 (1/2)^n

n=3

T = n * t½

T = 3 * 20

T =60