by Stevan Ang
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Energy propogated from one point to
another as a wave.(longitudinal wave)
How is sound produced?
Sound waves is produced by
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
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)
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
when the reflected sound is heard as a
separate sound after an interval of silence
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 of a note depends on its
frequency., the higher the frequency the
higher the pitch
Loudness and Amplitude
Larger Amplitude= Loud
Small Amplitude= Soft
Sound with frequency above 20kHz
Sonar: Technique of using
ultrasound to locate underwater
Used to clean small,intricate
items such as
used in quality control and continuous
monitoring during manufacturing