Question: The sound produced by a jet engine was measured at a distance of 100 m in all directions. The loudness d of the sound (in

The sound produced by a jet engine was measured at a distance of 100 m in all directions. The loudness d of the sound (in decibels) was found to be d = 70.0 + 30.0 cosθ, where the 0° line was directed in front of the engine. Calculate d for θ = 54.5°.

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