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To determine the percentage of As-81 that remains undecayed after 43.2 seconds, you would need to know its half-life. As-81 has a half-life of approximately 46.2 seconds. Using the formula for radioactive decay, after one half-life (46.2 seconds), 50% would remain. Since 43.2 seconds is slightly less than one half-life, a little more than 50% of the sample remains undecayed, but the exact percentage requires calculations based on the exponential decay formula.
What else can I help you with?
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
When sample X is passed through a filter paper a white residue Y remains on the paper and a clear liquid z passes through. When liquid Z is vaporized another white residue remains. Sample X is B?
Sample X is likely a solution containing a soluble substance (B) and an insoluble substance (Y). When passed through the filter paper, the insoluble substance Y is caught while the soluble substance dissolves in liquid Z, which passes through. Upon vaporizing liquid Z, the soluble substance B remains as a white residue. Thus, sample X is a mixture of an insoluble solid (Y) and a soluble compound (B).
What happens to the standard deviation as the sample size increases?
As the sample size increases, the standard deviation of the sample mean, also known as the standard error, tends to decrease. This is because larger samples provide more accurate estimates of the population mean, leading to less variability in sample means. However, the standard deviation of the population itself remains unchanged regardless of sample size. Ultimately, a larger sample size results in more reliable statistical inferences.
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
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?
After 50 years, approximately 50% of tritium will remain undecayed in a sample. Tritium has a half-life of about 12.3 years, which means that the amount of undecayed tritium decreases by half every 12.3 years.
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?
Nitrogen-16 has a half-life of about 7.13 seconds. After 36.0 seconds, there would be 3 half-lives. Therefore, 1/2 * 1/2 * 1/2 = 1/8 of the original sample remains unchanged.
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.
What is the percent composition of NaHCO3 in a given sample?
To find the percent composition of NaHCO3 in a sample, you would calculate the mass of NaHCO3 in the sample divided by the total mass of the sample, then multiply by 100 to get the percentage.
What happens to the mass of a radioactive isotope as it decays?
In reality, as the atoms gets decayed it gives out radiations such as alpha, beta and Gama. Alpha is a helium nucleus which is massive and beta is electron but fast moving and Gama is an electromagnetic radiation. So as the atom decays then its mass is likely to be reduced. Rutherford's radioactive law deals with the number of atoms undecayed present at an instant 't' given in the form N = No e-lambda t Here No is the total atoms present both decayed and undecayed in a sample. N is the number undecayed present lambda - the decay constant t - the time elapsed
How to find the percent by mass of a compound in a given sample?
To find the percent by mass of a compound in a given sample, you need to divide the mass of the compound by the total mass of the sample and then multiply by 100. This will give you the percentage of the compound in the sample.
After three half-lives what fraction of a radioactive sample remains?
1/8 of the original amount remains.
