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in medicine : X-rays are used for harder tissues. Ultrasonography is important to medicine because it can be used diagnostically and therapeutically. Focused sound waves can be used to clean your teeth, to break up a cloudy film called a cataract that can cover the lens of your eye, and even to break up gallstones and kidney stones.
in technology : The radio waves used by mobile devices are part of the electromagnetic wave spectrum and travel at the speed of light. Your mobile uses radio waves to transmit signals to a network of base stations. Mobile devices need the antennas on top of the masts to send and receive your communications.
at home : Waves are a very important and necessary part of the workings of our planet; the motions they create perform a vital role in transporting energy around the globe and shaping the coastlines.
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Explanation: