A radioactive substance has a half-life of 3 days. If a mass of 1.55g of this substance is left after decaying for 15 days, determine the original value of the mass
-
A.
49.6g -
B.
37.2g -
C.
24.8g -
D.
12.4g
Correct Answer: Option A
Explanation
(1 to frac{1}{2} to frac{1}{4} to frac{1}{8} to frac{1}{16} to frac{1}{32})
(frac{1}{32} = 1.55g)
1 = 1.55 x (frac{32}{1} = 49.6g)