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Detailed explanation-1: -Terms relating to wave depth a described in detail in Table 4.9. Deep-water waves are waves traveling across a body of water where depth is greater than half the wavelength (D > 1/2 L).

Detailed explanation-2: -Waves change speed when they pass across the boundary between two different substances, such as light waves refracting when they pass from air to glass. This causes them to change direction and this effect is called refraction. Water waves refract when they travel from deep water to shallow water (or vice versa).

Detailed explanation-3: -Although the wave slows down, its frequency remains the same, due to the fact that its wavelength is shorter. When waves travel from one medium to another the frequency never changes. As waves travel into the denser medium, they slow down and wavelength decreases.

Detailed explanation-4: -When water wave travels from a deep to shallow region, its speed is slowed down while its frequency remains constant. Since speed of wave = frequency x wavelength, the wavelength will decrease too.