Final answer:
The amount of time it takes for the persisting sound to decrease to 60 dB below the level of the original sound is 12 seconds.
Step-by-step explanation:
The amount of time it takes for the persisting sound to decrease to 60 dB below the level of the original sound depends on the specific situation and factors involved.
However, I can explain how to calculate the time it takes for sound intensity to decrease by a certain number of decibels.
First, you need to know the sound decay rate, which depends on the specific medium the sound is traveling through. Let's assume the decay rate is 5 dB per second.
To find the time it takes for the sound intensity to decrease by 60 dB, you divide 60 by the decay rate:
Time = (60 dB) / (5 dB/s) = 12 seconds.