An echo is the reflection of sound waves off distant objects, whereas flutter echoes bounce repeatedly off multiple surfaces. An example of an echo is when someone shouts into a well, or along canyon walls, and the sound... More » Science Physics Optics & Waves

Ultrasound consists of a series of extremely high-frequency waves of sound, which may be bounced off of objects to form an image in three dimensions, according to ICU Sonography. Ultrasound scanners are used to noninvasi... More » Science Physics Optics & Waves

All surfaces absorb sound to some degree, and sound waves go through solid objects just like they do through open air, although solid surfaces absorb more of the sound. Unless they have significant insulation or consist ... More » Science Physics Optics & Waves
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An echo occurs when a sound wave reflects back towards its source after hitting a hard surface. Although the surface may absorb some of the sound, the remaining sound that is not absorbed continues moving, creating addit... More » Science Physics Optics & Waves

An echo is weaker than the original sound because the sound wave imparts energy to the surface from which it bounces. When a sound wave is directed at a distant surface, particles of air in the path transmit the energy t... More » Science Physics Optics & Waves

Echoes work through the reflection of sound waves. When a person shouts into a well or canyon, and they hear an echo, it is because the sound waves reflect from the canyon wall or the bottom of the well and travel back t... More » Science Physics Optics & Waves

The difference between reflection and refraction is that in reflection waves bounce off of a surface while in refraction those waves do not bounce back but pass through the surface, which bends them and changes the speed... More » Science Physics Optics & Waves