Describe how the carbon-14 dating technique works. What will be an ideal response?
Carbon 14 is constantly formed in the upper atmosphere when cosmic rays strike the upper atmosphere
gases, splitting their neutrons into protons and neutrons. A neutron strikes the nucleus of a nitrogen
atom, and is absorbed; a proton is emitted. The atom has now become carbon 14, which is rapidly
assimilated into the carbon cycle, along with carbon 12 and 13, and absorbed by all living organisms.
When an organism dies, carbon 14 is not replenished, and the ratio of carbon 14 to carbon 12
decreases as carbon 14 decays back to nitrogen by a single beta decay step.
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Indicate whether this statement is true or false.
Ecosystems contain organic elements only
Indicate whether the statement is true or false.
Which type of strength test measures the shear strength of a material along the failure plane?
a. triaxial test b. consolidation test c. unconfined compression test d. direct shear test
Give an example of cost-benefit analysis. Do not use the providing clean water and improved sanitation example given in the book. Be sure to explain all the variables affecting the costs and benefits of your decision. Based on your analysis, state whether you would be for or against the product you analyzed.
What will be an ideal response?