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What must be true for radioactive dating to be possible with a certain sample?
For radioactive dating to be possible, the sample must contain a measurable amount of a radioactive isotope with a known decay rate. The sample must be isolated from sources of contamination that could affect the accuracy of the dating. Additionally, the sample must have remained a closed system since the radioactive isotopes were incorporated, in order to accurately measure the decay products.
What two things must be true for samples to be useful?
they must be correct and they must be the right kind of sample
What measurements must you make to find the density of a sample of matters?
density = mass / volume. so you need to weigh to find the mass. To find the volume submerse in water and record the displacement of water to find the volume.
When anazlyzing a water sample for presence of an ion using precipitation reactions why should the entire sample not be used in the process explain?
Using the entire sample could lead to excessive ion precipitation, making it difficult to accurately measure the presence of the ion. It is important to use a portion of the sample to avoid overwhelming the precipitation reaction and ensure a more precise detection of the ion in question.
How can one effectively interpret a gel electrophoresis ladder?
To effectively interpret a gel electrophoresis ladder, one must compare the bands of DNA or RNA in the sample to the known sizes of the ladder's bands. This allows for determination of the size of the fragments in the sample.
What must be true for radioactive dating to be possible with a certain sample?
For radioactive dating to be possible, the sample must contain a measurable amount of a radioactive isotope with a known decay rate. The sample must be isolated from sources of contamination that could affect the accuracy of the dating. Additionally, the sample must have remained a closed system since the radioactive isotopes were incorporated, in order to accurately measure the decay products.
What do you do to perform Uranium-235 dating on a sample?
To perform Uranium-235 dating on a sample, you would measure the ratio of Uranium-235 to its decay product Lead-207 in the sample. By comparing this ratio to known rates of radioactive decay, you can determine the age of the sample. This method is commonly used for dating rocks and minerals that contain Uranium-235.
What two things must be true for a sample to be useful?
they must be correct and they must be the right kind of sample
Additional information needed for carbon dating?
The count rate of carbon-14 (subtracting background radiation) from a fresh sample of the same substance you are testing so that one can compare the count rate of the old artifact. The half-life of Carbon-14 (5730 years) must also be known. You must know the background radiation to find the actual radiation being emitted from the artifact, the half-life of Carbon-14 and the total number of carbon atoms in the artifact for comparing ratios. The mass of nonradioactive carbon atoms is also needed.
What two features must a sample have if its to accurately represent a population?
The sample must be large and random.
What is a sample that that consists of everyone in the population?
It is not a sample. A sample must be a proper subset of the whole population.
In order to perform carbon 14 dating on an artifact what must be true?
The artifact must contain carbon-14.
When using data from population genetics research the sample must be?
The sample must have a high probability of representing the population.
What two features must a sample have to accurately represent a population?
A sample must be representative, meaning that it reflects the characteristics of the population it is drawn from. It must also be large enough to minimize sampling error and increase the likelihood of capturing the population's diversity.
Sample size must be equal for null hypothesis?
No.
A major rule in coordinating sentences is that a writer must coordinate elements that perform what?
The writer must perform an equal or similar function
How is that the random sample gives a fairly accurate representation of public opinion?
The larger the sample, the greater the accuracy, but in every case, the sample must be truly random.
