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1.By how many decibels do you reduce the sound intensity level due to a source of sound if you quadruple your distance from it? Assume that the waves expand spherically.

For this one do I have to find ratios of I1/I2 and then substitute it in beta= 10 log (I/Io). I found the ratios to be 16 and I dont know if that's right.

2. Two identical loudspeakers are 3.4 m apart. A person stands 5.8 m from one speaker and 3.6 m from the other. What is the lowest frequency at which destructive interference will occur at this point? The speed of sound in air is 343m/s

For this one I tried getting the lowest frequency by dividing longest wavelength with speed in the air...like 343/5.8=59. I am not sure if this is right

Please any hints will be appreciated