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1. The volume of a public address system is adjusted to 45DB for audience at a distance of 75m. A) What is the intensity

1. The volume of a public address system is adjusted to 45DB for audience at a distance of 75m. A) What is the intensity of sound in watt/m2? B) What is intensity 50m away? 2. A source of sound sends out 500vibrations per second in air. How long are these sound waves at 20C?

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1 aAs we know decibel level of sound is defined as Li 10 log I 120 Or 45 10 log l 120 O... blur-text-image

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