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Potassium-42 has a half-life of 12.4 hours How much of a 745 g sample will be left after 74.4 hours?
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How much of an 8 gram sample is left after 3 half lives?
2.66666666666667 grams
What is selected sample?
It is a sample in which the respondent decides whether or not to participate. A typical situation would be when a pile of questionnaires is left for people to fill in - if they like. Only those so inclined will do so.
How many days is 490 hours?
20 full days 10 hours left
If I work 12 hours and has already worked 4 what fraction of my shift is left?
If you worked 4 out of 12 hours, then 8 out of 12 hours are left or 8/12 of the shift which is the same as 2/3 of the shift.
You left yogurt out for 2 hours is it okay?
Yes
How much of an 848 g sample of potassium-42 will there be left after 62.0 hours?
5/100 or 1/20
How much of the original sample will be left at the end of the second day if a sample of radioactive isotope has a half life of 1 day?
Hi, Each half-life means the mass of the sample has decreased by 1/2 its mass. Thus; After 1 half-life, 1/2 the sample has decayed. After 2 half-lives 3/4 of the sample has decayed. Hope this helps.
A sample of radioactive isotope has a halflife of 1 day how much of the original sample will be left at the end of the fourth day?
If a sample of radioactive material has a half-life of one week the original sample will have 50 percent of the original left at the end of the second week. The third week would be 25 percent of the sample. The fourth week would be 12.5 percent of the original sample.
Sample questions for ACER exams for class 4?
You can try acer.edu.au and then go to sample questions (which will be in the left of the page).
How do you determine the half life of a radioactive substance that has changed through radioactive decay After 40 days the original substance left is is one sixteenth of the original amount?
the halflife is 10 days
How could you get a sample if soluble salt?
A saline sample is salt water. Evaporate the water away, and salt crystals will be left behind.
If Uranium has a halflife of 1 day how much is left at the end of the third day?
The half life of uranium is not one day. For an isotope with the half life or one day, after 3 days: the quantity remained is 12,5 %.
Sample sentence of the word toe?
"I was born with an extra toe on my left foot."
How many hours left for santa?
789 hours
Who long you can left the simple in the desiccator?
I think you should resubmit this question as How long can you leave a sample in a desiccator? and it would help if you gave information about what sample you are putting in.
How much of an 8 gram sample is left after 3 half lives?
2.66666666666667 grams
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.
