Wednesday, January 9, 2013

Use of Sound Waves

Introduction :
Sound waves are the travelling waves and longitudinal in nature. Sound waves are mechanical waves means they need a material medium for their propagation. When the sound waves travels through the medium, the pressure is exerted at the particular points so that there are two regions created: one is called compression where pressure is more and the density of the medium is more and the other is called rarefaction where the pressure is less and the density of the material is less.

Uses of Sound Waves : Different Types of Sound Waves

Audible sound waves are ranging from 20 Hertz to 20000 hertz. Sound waves having frequency less than the 20 Hertz are called the infrasonic and the sound waves having frequency more than the 20000 hertz are called ultrasonic. 

Uses of Sound Waves

(i) Geologists use the knowledge of sound waves to locate the oil reservoirs inside the earth surface.

(ii) Earthquakes can be detected by the waves travel through different kinds of rocks.

(iii) Sound waves are used in sonar, which can explore the sea bed and the entire sea.

(iv) Bats uses the sonar waves to detect the obstacles in the their path.

(v) Sound waves obey the rules of reflection so they produce echo. Echoes are used in medical fields.

(vi) Ultrasonic sound are used for examining the prenatal scanning.

(vii) Ultrasonic waves can be used to sterilize the delicate and costly instruments. In this process the instrument is suspended in the liquid and the ultrasonic waves pass through the liquid, which makes the liquid particles in the high frequency vibrations so that the surface of the instrument cleans.

(viii) Ultrasonic waves are used to detect the flaws and cracks in the metal sheets.

(ix) Sound waves are used to remove the congestion in lungs. There is a simple medical instrument called lung flute, which break up mucus in the chest cavity.

(x) Sound waves escaping from the Sun’s interior surface create lot of hot gases, which powers the chromospheres.

(xi) Ultrasonic waves are used in the diagnostic sonography, in which we can detect the body structures and the internal organs of the human body. We can detect the tumors by use of the ultrasonic waves.

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