Solve the Problem $$\mathrm { A } = \mathrm { Ie }^{ { kt }}$$

question 397

Multiple Choice

Solve the problem.
-In the formula A $$\mathrm { A } = \mathrm { Ie }^{ { kt }}$$ A is the amount of radioactive material remaining from an initial amount I at a given time t and k is a negative constant determined by the nature of the material. A certain radioactive isotope has a
Half-life of approximately 1450 years. How many years would be required for a given amount of this isotope to
Decay to 60% of that amount?

• A) 1069 yr
• B) 580 yr
• C) 1009 yr
• D) 1917 yr

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Definitions:

Domestic Supply Curves

Graphical representations of the relationship between the price of a good or service and the quantity of that good or service supplied domestically.

Domestic Demand Curves

Graphical representations showing the quantity of a particular good or service that consumers in a domestic market are willing and able to purchase at various prices.

Import Demand Curves

Graphs showing the quantities of a good that an economy is willing to import at different price levels.

Export Supply Curves

Graphical representations showing the relationship between the price of goods in the international market and the quantity of those goods a country is willing to supply for export.