Final answer:
The wavelength and speed of a wave have an inversely proportional relationship, and the movement of water in a wave decreases with depth.
Step-by-step explanation:
The general relationship between wavelength and wave speed can be understood through the fundamental formula for wave motion: wave speed (v) equals frequency (f) times wavelength (λ). This means for waves in the same medium, speed is constant and the relationship between wavelength and frequency is inversely proportional; as one increases, the other decreases. In deep water, water waves are known as surface waves. The movement of water particles in these waves diminishes with depth, which means the correct answer is a) inversely proportional; Decreases with depth.