From the general equations of sound we know that the Intensity is directly proportional to the square of the distance. Therefore the relationship,
It will help us find the change between the two points. If the relationship is maintained, the intensity of point one versus point two will be given by the square of the distance of the other two points, therefore
From the statement it is given that the distance is 3.8, therefore
and
PART A) The intensity given under the previous equation found is
Therefore the sound intensity at point 2 is 0.00027W/m^2
PART B) For the sound level in decibels we will apply the logarithmic equation that relates the intensities, therefore
Where is the threshold intensity and is given by
Then,
Therefore the sound intensity level relative to the threshold of hearing is 84.31dB