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noise a certain type of sound that is often thought of as harsh, unwanted or surprising fade what a sound wave does as its energy is used up echo a sound wave that bounces back toward a source and is heard echolocation/echoes what oilbirds use to help them "see" in dark areas sonar a type of echolocation that locates items underwater ultrasound technology that uses the echoes of high-frequency sound waves to "see" inside the human body music the study of this helped in the development of early ideas and theories about sound oscilloscope on this the waves of calm sound are usually seen as smooth curves, while the waves of harsh sounds look rough and jagged acoustics the science of sound reflect what smooth, hard surfaces usually do to sound absorb what soft, or fuzzy surfaces usually do to sound