# Mechanical waves and some technological applications of sound mechanical waves

Mechanical waves are the waves that propagate through a material medium (the solid, the liquid, or the gas) at a wave speed that depends on the properties of that medium. The mechanical waves need a medium to travel through, They do not travel through free space (the vacuum).

## The mechanical waves

The mechanical wave is the wave that is an oscillation of the matter, and therefore it transfers the energy through the medium, While the waves can move over long distances.

the movement of the medium of the transmission, the material is limited, So The oscillating material does not move far from its initial equilibrium position.

Mechanical waves transport the energy that propagates in the same direction as the wave, Any kind of wave (mechanical or electromagnetic) has a certain energy, They can be produced only in media that possess elasticity and inertia.

Mechanical waves differ from electromagnetic waves because the energy is transferred through another medium like the metal in a slinky, rather than through the vacuum such as light through outer space.

The mechanical waves act as the propagation of the disturbance through the material medium due to the repeated periodic motion of the particles of the medium.

The water waves and the sound waves are examples of mechanical waves,Â There are three types of mechanical waves such as transverse waves, longitudinal waves, and surface waves.

The mechanical waves are characterized by:

1. The vibration of the medium particles produces mechanical waves.
2. Their speed is relatively low (The speed of the sound is about 340 m / s).
3. They need a medium (such as liquids, gases, and solids) to transfer through.

### Applications of sound mechanical waves

• The sound waves (Ultrasonic waves) are used in examining and curing the sets of the human body.

• The musical instruments :Â

The stringed musical instruments (contain the strings) such as the violin, The lute, and The guitar.Â

The sound waves are very important in pneumatic musical instruments such as the flute or the reed pipe.

• The sound waves are used in the amplifiers and the sets for distributing and controlling the sound used in the broadcasting studios.

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