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Sound waves

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Thesis: Sound waves are able to carry vibrations through a medium which results in the transfer of the energy collected in the vibrations. Transverse waves are vibrations which are at right angles to the wave’s direction of travel whereas longitudinal waves are vibrations along the line of wave’s direction of travel. These waves have a quantifiable speed, wavelength and frequency. Owing to these properties, sound waves have scores of uses.

Introduction: Human ear is capable of hearing sounds with frequencies of about 30Hz – 20 kHz. Sound waves are able to travel best through rigid solids rather than through liquids and gases. However, human ears have got accustomed to sound waves passing through air, so are able to hear various things. The loudness of the sound is based on the incoming waves’ amplitude whereas the pitch of the sound is based on the incoming waves’ frequency. Musical instruments work by building up regular

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Ultrasonic waves are also beneficial for cleaning intrinsic jewelry, parts of machineries as well as electronic components. Some innovative ideas are to clean dirt from items in the bath with the usage of ultrasonic waves. Another most common usage of ultrasonic waves is for medical purposes which are predominantly known as Ultrasound. This is used to remove stones from the kidney. The usage of ultrasound replaces complicated operations and enables doctors to break down the stones in the kidney into small pieces without causing any problem to the other parts of the body.

Ultrasound is also able to find out what is happening inside the body. The reflected waves of the sound are administered into a computer which enables the formation of pictures called a `Sonagram or medical scanning’. Ultrasound are able to penetrate the body easily, however, some is reflected off each tissue boundary. The bounced back pulses are used to build up a picture of inside the body. [Other Uses Of Sound Waves, 2004]

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Similar concept works for Doppler radars which is very useful as a weather forecasting tool with the use of radio waves. These radars are used to calculate the frequency change in returning radio waves. Waves bounce back by something moving away from the antenna change to a lower frequency whereas waves from an object moving toward the antenna change to a higher frequency. A computer which is connected to a Doppler radar uses these frequency changes to show directions and speeds of the winds blowing around the rain drops, insects and other objects that reflected the radio waves and provides pictures.

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