The question, as posed cannot be answered because you have not stated the units for the half-life. Some things have half lives of millions of years while others have half-lives measured in micro-seconds. Fortunately, Wikipedia came to my rescue and the half-life is 1600 years (approx). The answer is approx 4.3 grams.
27divide 226 = 0.11946902654867257
37.6667
113
It is: 226/3 = 75 with a remainder of 1
1.875g
After 4 half-lives, the amount remaining is ( (1/2)^4 ), which equals 1/16. Therefore, 1 gram of radium-226 will have 1/16 gram unchanged after four half-lives, which is 0.0625 grams.
(1/2) pound = 226 796.185 milligrams
After each half-life, half of the radium-226 will decay. Therefore, after four half-lives, 1/2^4 or 1/16th of the original gram of radium-226 will remain unchanged. This means that 1/16th of a gram, or 0.0625 grams, will still be unchanged after four half-lives.
8 ounces = Half a Pound OR 226 Grams
226 x 1 = 226 226 x 2 = 452 226 x 3 = 678 226 x 4 = 904 226 x 5 = 1130 226 x 6 = 1356
The question, as posed cannot be answered because you have not stated the units for the half-life. Some things have half lives of millions of years while others have half-lives measured in micro-seconds. Fortunately, Wikipedia came to my rescue and the half-life is 1600 years (approx). The answer is approx 4.3 grams.
113 x 2 is 226
The cube is raised to the power of 3, or 226 x 226 x 226 = 11543176.
After 1600 years, half of the 20 grams of Ra-226 will remain, so 10 grams will be left. After another 1600 years (3200 years total), half of the remaining 10 grams will remain, resulting in 5 grams of Ra-226 left.
226 2,113
78% of 226 days= 78% * 226= 0.78 * 226= 176.28 days