Two Identical Loudspeakers Are Driven in Phase by the Same

question 86

Multiple Choice

Two identical loudspeakers are driven in phase by the same amplifier.The speakers are positioned a distance of 3.2 m apart.A person stands 4.1 m away from one speaker and 4.8 m away from the other.Calculate the second lowest frequency that results in destructive interference at the point where the person is standing.Assume the speed of sound to be 340 m/s.

• A)245 Hz
• B)735 Hz
• C)1225 Hz
• D)490 Hz
• E)1470 Hz

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Definitions:

High-Low Method

A technique used in managerial accounting to estimate fixed and variable costs based on the highest and lowest levels of activity.

Electricity

A form of energy resulting from the existence of charged particles, used as a power source.

Variable Component

Denotes a part of a cost or expense that varies directly with the level of activity or output.

Mixed Cost

A cost that contains both variable and fixed cost elements, changing with the level of production or sales but not in direct proportion.