Pulse 1 moves to the right along a spring, as shown in Figure (a) below. Another

Question

Pulse 1 moves to the right along a spring, as shown in Figure (a) below. Another pulse {pulse 2. not shown) moves in the opposite direction along the same spring. Figure below shows the location of pulse 1 (dashed line) and the shape of the spring (solid line) at an instant while the two pulses meet. On Figure draw the shape and location of pulse S at the instant shown. Say why your answer makes sense to you in the space below. When a wave in the ocean hits a sea wall (as shown in the figure at right), it often dramatically crashes over the top of the wall, even though the amplitude of the incoming wave was much smaller than the height of the wall. How do you make sense of this phenomenon, using what you know or think about waves?

Explanation / Answer

when a wave hits a vertical wall , it experience equal and opposite force from the wall and gets reflected in opposite direction. This results in constructive inteference and hence the amplitude of the wave becomes bigger than the wave before.This is the reason the wave often crashes over the wall

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