2.5
Yes it is used for this.
Any radioactive isotope decays with time into something else (another element) the time it take for 1/2 of it to have decayed to this other element is called its half life.
If one knows how much of this radioactive material was present initially in the object (by determining how much of the material has decayed), and one knows the half-life of the material, one can deduce the age of the object.
For instance the decay of 238U to 206Pb, has a half-life of 4.46 billion years and the decay of 235U to 207Pb, has a half-life of 704 million years and this allows you to measure the age of the planet itself.
2.5 grams of C14 would be left after two half-lives.
10 g of activity will decay to 2.5 g after 2 half-lives.
AN = A0 2(-N/H) where N is half-lives, A is activity, and H is half-life.
After one half live, there will be 5 grams left. And after 2 half lives, there will be 2.5 grams left.
4
The sample must contain Uranium-235.
The sample must contain radioactive elements.
The conclusion is that the sample contain proteins.
to avoid the light go through in the sample and keep the sample cool also.
high
a control
a control
Why is it that dried food sample can contain lower numbers of microorganisms
Opportunity sampling is a type of non-probability sampling technique where researchers select participants who are readily available and willing to participate in the study. This method is convenient but can introduce bias because the sample may not be representative of the entire population.
The sample must contain Uranium-235.
The sample must contain radioactive elements.
A pure and fresh prepared uranium sample don't contain plutonium; only the irradiated (in a nuclear reactor) uranium contain plutonium.
A 88,1 gram sample of Ag contain 4,9185.10e23 atoms.
That depends on the particular sample of DNA.
350 g sample of CO contain 12,49 moles.
23.3 grams
which sample contains visible particles