A 2000-Ng Sample of Sodium-24 Was Stored in a Lead-Lined Cabinet

question 74

Multiple Choice

A 200.0-ng sample of sodium-24 was stored in a lead-lined cabinet for 45 hours.The half-life of sodium-24 is 15 hours.How much sodium-24 remains?

• A)100 ng
• B)75 ng
• C)50 ng
• D)25 ng
• E)13 ng

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Definitions:

Price Elasticity

The measure of how much the quantity demanded of a good responds to a change in its price, with elasticity greater than one indicating a high sensitivity to price changes.

Supply Elasticity

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

Equilibrium Price

The equilibrium price where the supply of goods meets consumer demand.

Horizontal Supply Curve

Represents a market situation where the supply of a good is perfectly elastic, indicating the supplier is willing to sell any quantity at a fixed price.