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Feldspar has 98 atoms of 40Ar every 97 atoms of 40K. 10.9% of 40K decays to 40Ar. t(1/2)=1.25E9
0.693/1.25E9= 567E-10 = K
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What scientific test can you use to work out the age of an object?
scientists can determine the age of somthing by finding out how much carbin 14 there is left in the sample. the reason fro using carbon 14 is because it has a very predictable half life of 5730(plus or minus 40) years. half life is the decay rate of certain materials. by knowing the begging amount of carbon 14 present in the sample they can determine by the amount left how old it is.this is a pretty easy subject to look up if you have any pther questions.
Why is a conical cap provided to a pycnometer?
A conical cap is provided to a pscnometer to determine the volume of the test sample.
What happens when carbonic acid is mixed with feldspar?
Feldspar, a major constituent of most igneous rocks, reacts with carbonic acid to produce residual clay minerals plus dissolved ions of metals (potassium, sodium or calcium, depending on the type of feldspar). Here, for example, is the reaction by which potassium feldspar is converted to kaolinite, a clay mineral: 4KAlSi3O8 + 4H2CO3 + 2H2O → Al4Si4O10(OH)8 + 4K+ + 4HCO3- + 8SiO2 feldspar + carbonic acid + water → kaolinite + dissolved potassium and bicarbonate ions + dissolved silica Similar reactions affect sodium feldspar and calcium feldspar.
Which of these is not used to determine the age of an object?
magnetometer
For this statement which could be a hidden variable?
Type your answer hereWhich people were selected for the sample.. Age
What type is Sample B on Mineral Identification on Gizmo's?
feldspar
What is used to determine the absolute age of a sample?
Carbon dating. Google it
Can the age and sex be determine by hair sample?
Usually, yes, you can get a rough guesstimate of a persons age from their hair sample, you can usually tell male or female also.
What minerals determine the color of granite?
The color and type of feldspar minerals largely determine the color of a particular granite.
How old is a live oak tree that is 17 feet in diameter?
A core sample would have to be taken to determine its age
What is the measuring of the ratio of unstable and stable atoms in a rock sample to determine the age of the fossil it contains?
Radiometric dating.
What is the maximum amount of plagioclase feldspar possible in a sample of granite?
65%. Any more, and it is not considered granite.
What is the use of measuring the activity of a radioactive isotope in a sample to determine its age?
radioactive dating
Minerals that determine the color of the granite?
These minerals are quartz, feldspar, mica, and usually hornblende.
How do you determine an adequate sample size?
A sample size is needed whenever you conduct an experiment. How you determine an adequate sample size depends on the scope of what you're testing, such as medications.
Can you tell age from a blood sample?
Yes. In a similar way that scientists can use carbon dating to determine the age of fossils, a new method allows an individuals age to be determined from their blood. X-ray florescent spectroscopy allows the bloods plasma to be analyzed with enough precision to determine age within the year.
What determines the color of the granite?
The color and type of feldspar minerals largely determine the color of a particular granite.
