The Brainliest Answer!
1. Sound is produced by vibrations and is a type of mechanical energy. 2.  Sound travels in compression waves and at a speed much slower than light. 3. Sound needs a medium (solid, liquid, or gas) in which to travel. 4. In a compressional wave, matter vibrates in the same direction in which the wave energy travels. 5. All waves exhibit certain characteristics: wavelength, frequency, and amplitude. 6. As wavelength increases frequency decreases. 7. The speed of sound depends on three things: the medium through which the waves travel, the density, and the temperature of the medium. 8. Reflection and interference patterns are used in ultrasonic technology, including sonar and medical diagnosis.
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sound is a mechanical wave that  is an oscillation of pressure transmitted through a solid, liquid or gas, composed  of frequencies within the range of hearing and of a level sufficiently stronge to be heard,or the sensation stimulated in organs of hearing by such vibration.
it is desirable to write in simple sentences rather than writing definition in complicated and tough language.
every one has a text book to read such definitions.. if some one asks a question here, it means we explain in simple sentences. okay?