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Introduction and source of sound
Different types of sound are heard at different situations such as when rivers flow, birds sing, dogs bark, machines start working, acroplanes take off, people talk etc, What happens in the source of sound? How is sound produced? How is it transmitted and how does we hear it ? Sound is a form of energy whose typical sensation is carried to the brain through ears from any vibrating body through a material medium. A medium is necessary for its propagation. The medium may be solid, or liquid, or gas. Like light, sound waves also reflect, refact, interfere with one another to produce areas of louder and softer sound and differact round corners. But sound waves are very different in nature from light waves. Light propagate in the form of transverse wave and sound in the of longitudinal wave.
Source:
Sound is produced by any vibrating object. So any vibrating object is the source of sound. When an object is jerked, it vibrates. When a person speaks, lungs force the air out causing the vocal cords of the laryns at the throat to vibrate.
Experiments to demonstrate the production of sound:
1. Take a steel ruler and fix one end of it on the edge of a table. Now hit or distrube the other free end of the ruler.
Observation: Rurler vibrates and sound is heared.
2. Take a tunning fork and strike it against a soft pad.
Observation: Two progs of the tunning fork vibrate and a distinct sound is heard.
The above experiment show that sound is produced by the vibration of the source. Mechanical energy is needed to make the source to vibrate. It is this energy that the vibrating object loses to the surrounding particles and is carried to all directions. Sound production is stopped when it stops to vibrate.
