Aforce acting through a distance

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.

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.