In a local metal processing factory, there are four machines operating during the 8-hour day shift....

 

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In a local metal processing factory, there are four machines operating during the 8-hour day shift. The following tables tabulates the sound intensity (1) in watts per m for each machine: Machine No. 1 2 3 4 Sound intensity (1) 104 4 X10-4 2 X10-4 10-5 1. What is the combined sound pressure level of the four machines measured in dB? 2. Assume that the combined sound pressure level measured in part (1) is measured by a sound level meter by an operator who stands one meter from each machine in the factory. Find the combined sound pressure level a worker who stands 10 meters from the operator in the factory? 3. Redo part (2) but for a director who stands 50 meters from the worker? In a local metal processing factory, there are four machines operating during the 8-hour day shift. The following tables tabulates the sound intensity (1) in watts per m for each machine: Machine No. 1 2 3 4 Sound intensity (1) 104 4 X10-4 2 X10-4 10-5 1. What is the combined sound pressure level of the four machines measured in dB? 2. Assume that the combined sound pressure level measured in part (1) is measured by a sound level meter by an operator who stands one meter from each machine in the factory. Find the combined sound pressure level a worker who stands 10 meters from the operator in the factory? 3. Redo part (2) but for a director who stands 50 meters from the worker?

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