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The level of sound formula $\"\"$ .

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The initial intensity value, $\"\"$ watt per square meter and rustle of leaves of intensity $\"\"$ watt per square meter.

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$\"\"$ (Write original equation)

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$\"\"$ (Substitute values of $\"\"$ )

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$\"\"$ (Simplify)

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$\"\"$ (Use calculator) $\"\"$

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The level of sound $\"\"$ .

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$\"\"$

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The level of sound formula $\"\"$ .

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The initial intensity value, $\"\"$ watt per square meter and intensity of jet at 30 meters, $\"\"$ watt per square meter.

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$\"\"$ (Write original equation)

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$\"\"$ (Substitute values of $\"\"$ )

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$\"\"$ (Simplify)

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$\"\"$ ( $\"\"$ )

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$\"\"$ (Use calculator) $\"\"$

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The level of sound $\"\"$ .

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$\"\"$

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The level of sound formula $\"\"$ .

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The initial intensity value, $\"\"$ watt per square meter and the intensity of door slamming, $\"\"$ watt per square meter.

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$\"\"$ (Write original equation)

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$\"\"$ (Substitute values of $\"\"$ )

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$\"\"$ (Simplify)

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$\"\"$ ( $\"\"$ )

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$\"\"$ (Use calculator) $\"\"$

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The level of sound $\"\"$ .

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$\"\"$

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The level of sound formula $\"\"$ .

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The initial intensity value, $\"\"$ watt per square meter and the intensity of siren at 30 meters, $\"\"$ watt per square meter.

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$\"\"$ (Write original equation)

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$\"\"$ (Substitute values of $\"\"$ )

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$\"\"$ (Simplify)

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$\"\"$ ( $\"\"$ )

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$\"\"$ (Use calculator) $\"\"$

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The level of sound $\"\"$ .