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At sample of 131 I decays to 1.0 grams in 40 days. What was the mass of the original sample?
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What is the half life of 12 g sample of radioisotope that decayed to 6 g in 28 years?
28 years
How many days until one-sixteenth of a 54.2 g sample of thorium-234 remains?
The number of days is 96,4.
What is the mass of the isotope 195Au?
195Au is an isotope of gold with a half life of about 186 days. It decays into 195Pt, an isotope of platinum. Its mass is 194.97 atomic mass units.
How much time has passed if carbon -14 has a half life of 5730 years and 2 half lives have passed?
By observing how much decays in a few days, or in a year, and extrapolating.
After how many days 1-4 of the original amount of gold 198 will remain?
After 5.4 days
What is the half life of a radioactive isotope if it takes 6.2 days for a 72 gram sample to decay to 18grams?
18 grams are one fourth of the original sample mass of 72 grams. Accordingly, the half life is 6.2/4 = 1.55 days.
Determine the amount of time it takes for three fourths of a radioactive sample of an isotope to decay?
The half-life is 4 days. That means half of it will be gone in 4 days, and that leaves half of the original sample. In another 4 days, half of the remaining half will have decayed. And that will leave only 1/4 th of the original sample. That means 3/4 ths of the original sample will have decayed. In 8 days, three fourths of a sample of a radioactive element with a half-life of 4 days will have decayed.
What is the sample of the radioactive isotope 131I decays its half-life?
Iodine-131 has a half-life of about 8 days.
What is the total mass of 222Rn remaining in an original 160-milligram sample of 222Rn after 19.1 days?
5.0 mg is the total mass of 222Rn remaining in an original 160-milligram sample of 222Rn after 19.1 days.
Why is there limited information about astatine?
The only way to make it is with a particle accelerator, the amounts made are too small to see, and a given sample decays almost completely in a few days.
Thorium-234 has a half life of about 24 days of a sample that originally contained 100 grams of thorium-234 now only contains 25 grams.what is the age of the sample?
25 grams of Thorium-234
What is the half-life of a radioisotope if a 40 g sample becomes 10 g after 20 minutes?
10 minutes. APEX ^-^
Radon has a half-life of approximately 4 days If you have a sample of radon with a mass of 4 grams how many grams will be left at the end of 8 days Is it 4 2 1 or none of these?
This question cannot be answered. This does not make any sense.
Radioactive iodine 131 has a half life of eight days The amount of a 200.0 gram sample left after 32 days would be?
You start with 5 grams- every 8 days, half of what is there goes away. At 8 days. there will be 2.5 grams. At 16 days, half of THAT is gone- now down to 1.25 grams. At 24 days, half of THAT is gone, leaving 0.625 grams. At 32 days, you have half of 0.625 grams. so divide .625 by two and you get .3125.
How many grams of a 250-g sample of thorium-234 would remain after 40 days had passed?
79 grams <><><><><> AT = A0 2 (-T/H) AT = 250 2(-40/24.1) AT = ~79
How big is a sampler mascara bottle?
Sample means a smaller portion of the original product, therefore a sample mascara bottle will be pretty small, probably lasting you 1-3 days max.
What is the half-life of a radioisotope if a 100 g sample becomes 50 g after 20 years?
18 days
