What are 3 procedures of having(making) spinners? Help!

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?

Which notation is used to represent an alpha particle? a. b. c. d.

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects