When you throw a stone into a calm lake, a circle of concentric waves is created and spreads around. The phenomenon that vibration created in one place spreads to the surroundings is called a wave. If you make a wave near the ball floating in the lake, the waves will be pushed to the lake, but the ball will not be pushed out and only vibrate in place. When the wave propagates, the medium vibrates only in place and does not move with the wave. Observe the motion of the duck. Are these waves longitudinal or transverse