Question: If the distance to a sound source is halved, (a) Will the sound intensity level change by a factor of (1) 2, (2) 1/2, (3)

If the distance to a sound source is halved,
(a) Will the sound intensity level change by a factor of (1) 2, (2) 1/2, (3) 4, (4) 1/4, or (5) none of the preceding? Why?
(b) What is the change in the sound intensity level?

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