An observer stands 3 m from speaker A and 4 m from speaker B. Both speakers, oscillating in phase, produce 170-Hz waves. The speed of sound in air is 340 m/s. What is the phase difference (in radians) between the waves from A and B at the observer's location, point P? 
Definitions:
Demand Curve
A visual depiction showing how the quantity of a product demanded by buyers varies with its price.
Horizontal Summation
A method used to determine the total market demand or supply by adding together the quantities demanded or supplied at each price by all individuals.
Substitution Effect
The change in consumption patterns due to a change in the relative prices of goods.
Upward-Sloping Demand
A theoretical market situation where, contrary to the typical downward-sloping demand curve, demand for a good or service increases as its price rises.
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