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Three sound sources in simultaneous operation combine to produce a noise intensity level of 73.3 dB...

Three sound sources in simultaneous operation combine to produce a noise intensity level of 73.3 dB at the ears of a listener. The source producing a 71.0 dB level and the source producing a 69.0 dB level are switched off. What is the sound intensity level at the listener’s ears due to the remaining source acting alone?

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