A Certain Radioactive Isotope Placed near a Geiger Counter Registers

question 67

Multiple Choice

A certain radioactive isotope placed near a Geiger counter registers 160 counts per minute. Eight hours later, the counter registers 10 counts per minute. What is the half-life of the isotope?

• A)8 hours
• B)6 hours
• C)4 hours
• D)2 hours
• E)none of the above

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Definitions:

Price Rises

An increase in the cost of goods or services, which can affect consumer buying power and inflation rates.

Elasticity of Supply

A measure of how much the quantity supplied of a good changes in response to a change in its price.

Demand

The quantity of a good or service that consumers are willing to buy at a given price over a specific period of time.

Equilibrium Price

The market price at which the quantity of goods supplied equals the quantity of goods demanded.