Final answer:
The amount of time it takes for reverb to decay 60 dB cannot be determined without the initial time.
Step-by-step explanation:
The amount of time it takes for reverb to decay 60 dB can be calculated by using the relationship between intensity and sound level.
Each factor of 10 in intensity corresponds to a 10 dB change in sound level. In this case, we are looking for the time it takes for the intensity to decrease by a factor of 10^6, which corresponds to a decrease of 60 dB. To find the time, we can use the equation:
t = t0(10-60/10)
where t is the time it takes for the reverb to decay, t0 is the initial time (which we don't have in this case), and -60/10 is the change in sound level in terms of dB. Without the initial time, we cannot calculate the specific amount of time it takes for reverb to decay 60 dB.