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How much of a 100 gram sample of isotope remain unchanged after two hours?
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The human egg is prime for how many hours?
The human ovum can remain viable for about 48 hours. And sperm about 24 hours.
How much of an 848 g sample of potassium-42 will there be left after 62.0 hours?
5/100 or 1/20
When a radioactive tracer is used why is it best to use a radioactive isotope that decays into a stable isotope?
The principle behind the use of radioactive tracers is that an atom in a chemical compound is replaced by another atom, of the same chemical element. The substituting atom, however, is a radioactive isotope. This process is often called radioactive labeling.
How long are urine samples good for testing?
If properly sealed and stored, urine samples are good for testing up to 24 hours after the sample given. The urine sample should be in a sterile container within a sealed plastic bag and stored in a refrigerator.
How do you determine the organic content of a soil sample?
The best way to determine the organic content of a soil sample is the following: 1. First weigh the lab vessel that you will be putting your sample in and write it down. 2. Scoop in 5 g of the sample into the vessel then weigh it again. 3. Subtract the weight of the vessel by the weight you got in #2. This is your starting weight. 4. After adjusting the muffler furnace to 360 C, put the soil sample you have measured out that is in the lab container in the furnace for two hours. 5. After two hours, put on heat resistant gloves and take out the sample to allow it to cool. It will be very hot, much too hot to handle at the moment. 6. When it is cool, weigh the sample again, and just like in #3, subtract the weight of the vessel to this sample weight and you will get the weight of the sample without the weight of the organic matter. 7. Now divide the weight of the of the soil without the organic matter by the starting weight (which should be 5 g), then multiply by 100. This will give you the amount of soil in the sample. Now subtract by 100 from this amount and you will get the amount of organic matter in the soil. For example, If the end weight is 4.7g, then 4.7/5.0 = 0.94, which means that 0.94 x 100= 94%. Therefore, 100-94 = 6% of the soil sample is composed of organic matter.
Determine the amount of time it takes for three fourths of a radioactive sample of an isotope of bromine to decay the half-life of the isotope is 16.5 hours?
About 33 hours
What is the amount of time it takes for three fourthsof a radioactive sample of an isotope of bromine to decay if the half life of the isotope is 16.5 hours?
It takes 2 half lives for an isotope to decay to 0.25 of its original value. If the half life is 16.5 hours, then 2 half lives is 33 hours. AT = A0 2(-T/H)
How much Cu-64 would remain from a 2 mg sample after 12 hours?
1mg
How much Cu-61 half-life about 3 hours would remain from a 2 mg sample after 9 hours?
0.25
How much cu half life about 12 hours would remain from a 2 mg sample after 12 hours?
1 mg
How much Cu-61 would remain from a 2 mg sample after 6 hours?
0.5 mg
How much Cu-61 (half-life about 3 hours) would remain from a 2 mg sample after 9 hours?
.25 mg
How much Cu-64 (half-life about 12 hours) would remain from a 2 mg sample after 12 hours?
1 mg
How much cu-61(half-life about 3 hours) would remain from a 2 mg sample after 6 hours?
0.25 mg
How much Cu-64 half-life about 12 hours would remain from a 2 mg sample after 12 hours?
1 mg
How much Cu-64 half life about 12 hours would remain from a 2 mg sample after 12 hours?
1 mg
Molybdenum-99 has a half-life of 66 hours. After 132 hours how much of an initial sample of 10 ci of Mo-99 would remain?
2.5
