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1.) At the race track, one race car starts its engine with a resulting intensity level...

1.) At the race track, one race car starts its engine with a resulting intensity level of 107.9 dB at point P. Then 7 more cars start their engines. If the other 7 cars each produce the same intensity level at point P as the first car, what is the new intensity level with all 8 cars running? ____dB

2.) A 96.0-Hz sound wave is barely audible at a sound intensity level of 60.0 dB. The density of air at 20.0°C is 1.20 kg/m3. Speed of sound in air at 20.0°C is 343 m/s. What is the displacement amplitude of a 96.0-Hz sound wave? __ nm

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