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

question 32

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 .

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

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Definitions:

Amortization Of Discount

The process of gradually recognizing the discount on bonds payable as interest expense over the life of the bond.

Bond Interest Expense

The cost incurred by an issuer of bonds due to the interest it must pay to bondholders over the life of the bond.

Carrying Value

The book value of assets and liabilities as reported on the balance sheet, considering depreciation, amortization, or impairment.

Future Sacrifice

An expectation to forgo benefits in the future due to current investment or decisions.