Question

what are waves? how they are helpful​

Answer 1

Answer:

In fluid dynamics, dispersion of water waves generally refers to frequency dispersion, which means that waves of different wavelengths travel at different phase speeds. Water waves, in this context, are waves propagating on the water surface, with gravity and surface tension as the restoring forces.

Explanation:

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Answer 2

Explanation:

A wave is a kind of oscillation (disturbance) that travels through space and matter. Wave motions transfer energy from one place to another.Radio waves are used for communication such as television and radio. Radio waves are transmitted easily through air. They do not cause damage if absorbed by the human body, and they can be reflected to change their direction. These properties make them ideal for communications.