Two Loudspeakers Are Placed Side by Side and Driven by the Same

question 68

Multiple Choice

Two loudspeakers are placed side by side and driven by the same source at 490 Hz.A listener is positioned in front of the two speakers and on the line separating them,thus creating a constructive interference at the listener's ear.If one of the speakers is gradually pushed toward the listener,how far must it be moved to repeat the condition of constructive interference at the listener's ear? (The speed of sound = 340 m/s. )

• A) 1.44 m
• B) 0.69 m
• C) 0.35 m
• D) 0.17 m
• E) ​2.88 m

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Definitions:

Stock Put Option

A financial derivative that gives the holder the right, but not the obligation, to sell a stock at a specified price within a specified time period.

Stock Price

The price at which a particular stock is bought or sold on the market.

Put Contract

A financial contract giving the holder the right, but not the obligation, to sell a specific amount of an underlying asset at a set price within a specified time.

Put Premium

A Put Premium is the price that the buyer of a put option pays to have the right to sell a specified amount of an underlying asset at a set price before the option expires.