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Sound Joel Seah 3S2 by Mind Map: Sound Joel Seah 3S2
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Sound Joel Seah 3S2


A type of sound wave with frequencies higher than 20 KHz

Not audible to the human ear


Used in Sonography to look at and examine foetus in wombs

Used to clean jewellery or small intricate items


Sound is a mechanical wae that is an oscillation of pressure transmitted through a solid, liquid or gas, composed of frequencies within the range of hearing and of a level strong enough to be heard, or the sensation stimulated in organs of hearing by such vibrations.


Allows us to be able to communicate properly with each other.

Propagation of Sound

Sound waves are produced when a vibrating object alternately punches and pulls the air adjacent to it, causing small but rapid changes in the air pressure.


Tuning Fork, The prongs move outwards, layers of air particles are pushed close together so that a compression of the airof the air particles is formed. This disturbance of air particles is then passed from air particle to particle, causeing the compression to move outwards. when the prongs move inwards the air layers are pulled apart causing a rarefraction of the air particles. this series of compressions and rarefractions causes sound to be produced, New node

Audible Frequencies


Sounds above the upper hearing limit is called ultrasound while sounds below the lower hearing limit is called infrasound.

20Hz to 20KHz


Bats, They can produce and detect high ultrasonic sounds between 10KHz and 120 KHz in frequency.

Dog, High Ultrasonic sounds of above 20 KHz

Speed of Sound

At 0 Degrees Celsius it is 330m/s


The property that distinguishes sounds is its pitch, which depends on the frequency.


The higher the frequency of a sound, the higher its pitch


The greater the amplitude the louder the sound