The isotope has a half-life of 5,715 years. After 2,000 years, a sample of the isotope is reduced to 2.1 grams. What was the initial size of the sample (in grams)? How much will remain after 20,000 years (i.e., after another 18,000 years)? Round your answers to four decimal places.
A) 1.8735 g, 0.1656 g
B) 4.2824 g, 0.3786 g
C) 2.6765 g, 0.2366 g
D) 3.7471 g, 0.3313 g
E) 3.4794 g, 0.3076 g

Question

The isotope  has a half-life of 5,715 years. After 2,000 years, a sample of the isotope is reduced to 2.1 grams. What was the initial size of the sample (in grams)? How much will remain after 20,000 years (i.e., after another 18,000 years)? Round your answers to four decimal places. ​
A) 1.8735 g, 0.1656 g 
B) 4.2824 g, 0.3786 g 
C) 2.6765 g, 0.2366 g 
D) 3.7471 g, 0.3313 g 
E) 3.4794 g, 0.3076 g

Quizplus · Accepted Answer

The Answer of The isotope  has a half-life of 5,715 years. After 2,000 years, a sample of the isotope is reduced to 2.1 grams. What was the initial size of the sample (in grams)? How much will remain after 20,000 years (i.e., after another 18,000 years)? Round your answers to four decimal places. ​
A) 1.8735 g, 0.1656 g 
B) 4.2824 g, 0.3786 g 
C) 2.6765 g, 0.2366 g 
D) 3.7471 g, 0.3313 g 
E) 3.4794 g, 0.3076 g

The Isotope Has a Half-Life of 5,715 Years