This graph shows the position of an element of air as a function of time as a sound wave passes through it.Which letter corresponds to the period of the wave? 
Definitions:
Binding
A term used to describe an agreement, rule, or law that is legally or contractually enforceable, requiring adherence by the parties involved.
Equilibrium Price
The cost at which the amount of a product available matches the amount of the product desired.
Price Ceiling
A government-imposed limit on how high the price of a product can be charged in the market, usually to protect consumers.
Legal Minimum
A legally established lower boundary on the price at which a good or service can be sold in the market.
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