What is the sound intensity level

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I drive my car at VL= 18m/s down a road. Two motorcycles are also driving down the road, both at 20 m/s. When one motorcycle is ahead of me, and one behind me, I hear a beat frequency. The motorcycles' engines both produce a frequency of 400 Hz. The speed of sound is 344 m/s. When a motorcycle is 3m away, the intensity of the sound from the engine is 0.6W/m^2.

1. What is the sound intensity level (in decibels) of a single motorcycle engine at 3m.

2. If both motorcycles are 3m away, what is the sound intensity level (in decibels) of the sound from both of their engines combined?

Reference no: EM131059492

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