Two In-Phase Loudspeakers That Emit Sound with the Same Frequency

question 40

Multiple Choice

Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 5.00 m.A person is standing 12.0 m away from the wall,equidistant from the loudspeakers.When the person moves 1.00 m parallel to the wall,she experiences destructive interference for the first time.What is the frequency of the sound? The speed of sound in air is 343 m/s.

• A) 211 Hz
• B) 256 Hz
• C) 422 Hz
• D) 512 Hz
• E) 674 Hz

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Definitions:

Fixed Expenses

Costs that remain constant for a certain period of time regardless of changes in levels of production activity, such as lease payments or salaries of permanent staff.

Absorption Costing

A bookkeeping approach that incorporates every manufacturing expense, both steady and fluctuating, into the product's total cost.

Net Operating Income

The profit generated from a company's everyday business operations, excluding expenses and taxes.

Fixed Manufacturing Overhead

The total of all costs that remain constant regardless of the level of production, including expenses such as rent, utilities, and salaries of permanent staff in a manufacturing setting.