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1-In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain. ... Sound waves below 20 Hz are known as infrasound.
2-aThe source of sound can be both natural or man-made. Few examples of natural sound sources are humans, animals, flowing water, avalanches and many more. Sources of man-made sounds are vehicles, factories, fans, explosions, etc
3-pitch, in music, position of a single sound in the complete range of sound. Sounds are higher or lower in pitch according to the frequency of vibration of the sound waves producing them. ... Usually a′ above middle C (c′) is taken as a reference pitch.
4-20Hz
5-a sound or sounds caused by the reflection of sound waves from a surface back to the listener.
6-Sound intensity, also known as acoustic intensity, is defined as the power carried by sound waves per unit area in a direction perpendicular to that area. ... Sound intensity is not the same physical quantity as sound pressure. Human hearing is sensitive to sound pressure which is related to sound intensity.
7-Noise is unwanted sound considered unpleasant, loud or disruptive to hearing. From a physics standpoint, there is no distinction between noise and desired sound, as both are vibrations through a medium, such as air or water. The difference arises when the brain receives and perceives a sound
8-sHow is Sound Produced? Sound is produced when an object vibrates, creating a pressure wave. This pressure wave causes particles in the surrounding medium (air, water, or solid) to have vibrational motion. As the particles vibrate, they move nearby particles, transmitting the sound further through the medium.