Light is described as a wave and sometimes as a particle. what evidence supports the wave nature of light? (a couple sentences will do)

Which sound characteristic is not affected by the relative motion of an object

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply