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Sound by Mind Map: Sound
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Sound

Definition

Energy propogated from one point to another as a wave.(longitudinal wave)

How is sound produced?

Sound waves is produced by vibrating objects

Propagation of Sound

vibrating objects alternately pushes and pulls on the air adjacent to it.

Compression, Layers of air pushed close together.

Rarefaction, the air layers pulled together.

Transmission of Sound through a medium

sound waves need a medium for transmission.Cannot propagate through a vacuum.

Solid, Fastest,because it is the densest.

Liquid, faster than in gas, because it is denser than gas.

Gas, Slowest, less dense compared to solid or liquid.

the speed of sound depends on the differences in the strength of the inter-atomic forces and closeness of the atoms in the three states.( The denser the medium the faster sound travels)

Audible Frequencies

20Hz-20kHz(audible frequencies)

Ultrasound: Sounds above the upper hearing limit

Infrasound: Sounds below the lower hearing limit.

Echolocation:the sonarlike system used by dolphins,etc to detect objects by emitting usually high-pitched sounds that reflect off the object and return to the animal's ears or other sensory receptors.

Speed of sound

Distance/ Time Taken

Echo

when the reflected sound is heard as a separate sound after an interval of silence

v=2d/t

Reverberation

When you cannot hear the echo because the reflected sound follows so closely behind the direct sound that the two cannot be heard separately. It just seems that the original sound is prolonged.

Pitch and Frequency

Pitch:Property which distinguishes sounds.

pitch of a note depends on its frequency., the higher the frequency the higher the pitch

Loudness and Amplitude

Larger Amplitude= Loud

Small Amplitude= Soft

Ultrasound

Sound with frequency above 20kHz

Sonar: Technique of using ultrasound to locate underwater objects.

Used to clean small,intricate items such as jewelry,spectacles,etc.

used in quality control and continuous monitoring during manufacturing process.