Give answer or fight me

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 situation will produce the greatest change of momentum

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.