How shallow must the ocean floor be for waves to start to "feel bottom" for a wave set with a wavelength of 20 feet?

According to the rules of wave magnitude speed and motion, the magnitude of the orbit of the water molecules is proportional to depth and orbital motion a depth equal to 1/2 of the wavelength. Hence in order to feel bottom, the wavelength necessary should be less than or equal to the 1/2 of the wavelength.

for e2020. the answer would be some directions from the mountain range so we can find mt. whitney. to locate which direction is north, you should use a   compass. this would not only find mt. whitney, but also becuase of this long paragraph you would get points because it's not like anyone actually reads your work becuase once they read the first sentence it sounds dumb enough to not read becuase i'm not good at answering this but the answer is compass for your benefit.

for e2020 ; -;

's the question?