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# Learn Financial Freedom Step by Step

When a matter moves, it produces vibrations, these vibrations which is heard by humans and other living beings, is called sound. Sound can listen when vibration transport with the medium of air, liquid and so solid things.

1. Sound can not propagate in a vacuum or sky without any matter, it needs the solid, liquid, gas or plasma. The speed of transporting the sound in normal pressure and temperature is 332 m/ s ( Meter per second)

2. Sound is a mechanical wave, it is not light wave. A human being can listen only 20 hertz to 20 kilohertz (kHz). It is a total limit of human for listening to the sound. Animals have more power of listening than human being. We listen by perception by our brain. Sound wave less than 20 hz is infrasound and human can not listen but elephant and other animals can listen the sound below 20 hz and sound wave more than 20khz is ultrasound and human can not listen.

3. Microphone converts sound into electrical energy and loudspeaker converts electrical energy into sound energy.

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Svtuition: What is Sound?
What is Sound?