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What percent of a sample of As-81 remains undecayed after 43.2 seconds?
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What fraction of a radium sample will remain after 3240?
The answer depends on 3240 WHAT: seconds, days, years?
Why is it not practical to have a macroscopic sample that is 100 percent pure?
because
If 57 mg of radium 221 has a half life of 30 seconds. How long will it take for 95 percent of the sample to decompose?
try using my formula.... ar=a(1/2)^2t therefore, 57(.05) = 57(1/2)^2t and 57s cancels out, .05 = 1/2^2t log .05 = log .5^2t divide log .5 from both sides, 4.32 = 2t t = 2.16, therefore 126 seconds or 2 minutes and 6 seconds
The movie rating website rotten tomatoes reported that 92 percent of a sample of 39 movie critics hated the 2005 horror movie the fog is the 92 percent statistic or parameter?
parameter !
You decide to select ten percent of the inmates in a prison to receive a survey You decide you want your sample to be representative of the population What procedure would provide the most represent?
Select the sample so that it will have the same percentages of people that are men and women as are in the system, and also match the percentage based on educational background and ethnicity
What fraction of a sample of N 16 remains undecayed after 43.2 seconds?
1.5% remains after 43.2 seconds.
What is the fraction of a sample of tritium that remains undecayed after fifty years?
This fraction is 12,5 %.
What fraction of an original 20.00gram sample of nitrogen-16 remains unchanged after 36.0 seconds?
2
How many undecayed M and Ms would remain out of a sample of 600 M and Ms after three half lives?
75
Which fraction of an original 20.00-gram sample of nitrogen-16 remains unchanged after 36.0 seconds?
1/32
After one half-life what percent of the original uranium remains?
By definition, 50%. Half life is the time for half of the original sample to decay.
What fraction of a sample remains after three half lives?
An eighth remains.
What is the significance of a half life of a radioisotope?
It tells what fraction of a radioactive sample remains after a certain length of time.
Why After three half-lives what fraction of a radioactive sample remains?
The fraction that remains is 1/8.
If Astatine-218 has a half-life of 1.6 s Suppose you have a 1.2-g sample of astatine-218 How much of the sample remains unchanged after 6.4 seconds Explain how you solved the problem?
After 1.6 seconds, 0.6 g astatine-218 remains unchanged. This amount is reduced by half to 0.3 g at 3.2 seconds. It is halved again at 4.8 seconds to 0.15 g, and halved once more to 0.075 g unchanged after a total of 6.4 seconds.
After three half-lives what fraction of a radioactive sample remains?
1/8 of the original amount remains.
What is the percent of oxygen by mass in a pure sample of FeCr2O4?
the answer is 29 percent
