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What fraction of your lives you spend sleeping?
Roughly a third.
How much of one gram of radium -226 will remain unchanged after four half lives?
1g (1/2)4 = 1/16 g
How old is the specimen if the half-life is 300 years and there is 15 times more daughter product than parent material?
Age = no. of half lives x duration of each half life ratio of Parent nuclei : Daughter Nuclei 1 : 15 total of 16 parts, and for every 16 parts one part is a parent nuclei Mt = Mo x (0.5)^n Mt = amount remaining Mo = Initial amount n = number of 1/2 lives Mt = 1/16 (1/2)^n = 1/16 (1/2)^n = (1/2)^4 n=4 Age = 4 x duration of each half life Age = 4 x 300 Age = 1200 Therefore, the age of the specimen is 1200 years.
After years 14 of the original amount of colbalt 60 will remain?
Cobalt-60 has a half-life of approximately 5.27 years, meaning that after this period, half of the original amount will have decayed. After 14 years, which is about 2.65 half-lives, the remaining amount can be calculated using the formula: remaining amount = original amount × (1/2)^(time/half-life). Therefore, after 14 years, approximately 1/6 of the original amount of cobalt-60 will remain.
35 of students at Charles Walters Middle School live more than 7 miles from school. What fraction of the students lives more than 7 miles from school?
The answer depends on the total number of students at the school. Since this information has not been disclosed, it is not possible to answer the question.
After three half-lives what fraction of a radioactive sample will remain?
Approx 1/8 will remain.
What is the percentage of radioactive nuclei left after 3 half-lives have passed?
12.5%
What fraction of a radioactive sample remains after three half-lives?
Not sure what you mean by "had-lives". After 3 half lives, approx 1/8 would remain.
Why are the nuclei of elements with atomic numbers greater than 82 naturally radioactive?
Massive nuclei are unable to remain bound aganst the repulsive force of their protons, which all have positive charge. This also occurs with elements #43 (technetium) and #61 (promethium) which because of their particular nuclear geometry are inherently unstable and radioactive, with the only natural isotopes having half-lives of just over 2 years.
After three half-lives what fraction of a radioactive sample remains?
1/8 of the original amount remains.
What percentage of a radioactive element will remain after seven half lives?
After seven half lives, approximately 0.78125% (1/2^7) of the original radioactive element will remain. This can be calculated by repeatedly halving the remaining amount after each half life.
What is the percentage of radioactive nuclei left after 3 half lives have passed?
12.5%
Why After three half-lives what fraction of a radioactive sample remains?
After three half-lives, only 1/8 (or 12.5%) of the original radioactive sample remains. This is because each half-life reduces the amount of radioactive material by half, so after three half-lives, you would have (1/2) * (1/2) * (1/2) = 1/8 of the original sample remaining.
How much of the radioactive element will be left one billion years from now?
That depends on the "half-life" of that particular radioactive element, which the question forgot to state. They're all different. Various radioactive elements have half-lives ranging from microseconds to millions of years.
What percentage of a radioactive sample remains after 5 half-lives?
After 5 half-lives, 3.125% (or 1/2^5) of a radioactive sample remains. Each half-life reduces the sample by half, so after 5 half-lives, there is only a small fraction of the original sample remaining.
How much parent material will be left after five half-lives?
Only 1/32 of the original radioactive material will remain. (½)5 = 1/32
What fraction of a radioactive sample decays after three half lives?
If I take a radioactive sample of 400 moles of an unknown substance and let it decay to the point of three half-lives I would have 50 moles left of the sample. 1/2 of what is left will decay in the next half-life. At the end of that half-life I will have 25 moles left of the unknown substance or 4/25.
