As ocean waves get closer to the shore they slow down. this slowing causes them to bend and come in close to parallel with the shore. this is because shallow water and deep water can be thought of as two different media. this bending of a wave is the wave interaction known as a) diffraction b) interference c) reflection d) refraction

The correct answer is D) refraction! Hope this helps!

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.