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

question 99

Multiple Choice

Two speakers are placed side by side and driven by the same frequency of 0.50 kHz.If the distance from a person to one speaker is 5.0 m and the person detects little or no sound,which of the following is a possible the distance from the person to the other speaker? The sound speed in the room is 340 m/s.

• A)7.7 m
• B)8.1 m
• C)8.4 m
• D)9.1 m

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Definitions:

Service Brake Torque

The amount of torque applied by the service brake system to slow or stop a vehicle, typically measured at the wheels.

Brake Treadle Valve

A valve operated by a pedal that controls the flow of air or hydraulic fluid to the brakes.

Air Brake Treadle Valve

A valve controlled by the foot pedal in air brake systems, regulating air pressure sent to the brakes to slow down or stop the vehicle.

CMVSS 121

Canadian Motor Vehicle Safety Standard 121, concerning the requirements for air brake systems on heavy trucks and buses in Canada.