5 d) We define the path lengths L and L' between the landing and the two openings. Find the difference |L'-L| such that the condition from part c) is met! [note that there is no unique solution]. e) Find a design of the wall! That is, find the distance between the openings D and the distance of the wall to the shore D2. [Hint. One value is largely arbitrary.] 2.) Charlie is a smart physics student who also enjoys kayaking in the icy waters off the coast of Maine. The water is quite shallow near the landing adjacent to his boat house, and the depth varies between 0.9 m at low tides and 1.8 m at high tides. During stormy conditions, the wind conditions produce waves on the ocean surface with a typical period: Charlie counts 18 crests in half a minute [that is crest #1 at time t = 0s and crest #18 at time t = 30s]. wave crests D Landing Land 1.0 m 1.0 m Charlie designs a wall off the shore to protect the landing condition. The wall is parallel to the shore line at the distance D2. The wall needs an opening of about 1.0-m width so that he can pass through with his kayak. a) Find the wavelength of surface water waves at low and and high tides! b) Explain why an opening can be considered as a point source of an outgoing surface wave! Charlie is reminded of "noise canceling" head phones and designs a wall with two [and not just one] openings at the distance D from each other. Explain Charlie's reasoning! c) Charlie is ingenious and figures out an arrangement of the wall [that is, distances D and D2] such that the landing is protected during a storm both during low and high tides. Explain qualitatively how this is possible!