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Telecommunication. Sound Waves .

Telecommunication. Sound Waves . Sound energy travels in the form of waves. Sound can travel through solids , liquids and gases by vibrating the particles in the three types of materials. Telecommunication. Sound Waves.

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Telecommunication. Sound Waves .

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  1. Telecommunication.Sound Waves. • Sound energy travels in the form of waves. • Sound can travel through solids , liquids and gases by vibrating the particles in the three types of materials.

  2. Telecommunication.Sound Waves. • The particles in the three materials vibrate in the same direction as the wave motion. • This wave is called a Longitudinal Wave Sound waves cannot travel in a vacuum.

  3. Telecommunications.Sound Waves. • These waves then vibrate our ear drums which then activate small bones in our inner ear. • A diagram of the ear is shown.

  4. Telecommunication.The Ear. bones Ear drum Outer ear

  5. Telecommunication.The difference between sound and light waves. • Sound waves travel very much slower than light waves. • This can be seen by observing a thunder and lightning storm. • The light reaches us quickly but the sound from the thunder comes later.

  6. Telecommunication The speed of sound. • The speed of sound can be measured by by using two microphones and an electronic timer. • When the sound reaches the first mic, the timer starts.When the sound reaches the second mic, the timer stops. • If we know the distance between the two mics (say one metre) and the time , we can work out the speed.This is shown on the next slide.

  7. TELECOMMUNICATION. THE SPEED OF SOUND. Time = 0.003s Mic 2 Mic 1 Sound here Distance = 1 metre

  8. Telecommunication.Calculation of The Speed of Sound • The Speed of Sound can be calculated as shown below. • Speed = distance time = 1/0.003 = 330 m / s

  9. Telecommunication.The difference between sound and light waves. • Light is a transverse wave.The particles move at right angles to the wave as shown.

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