VIBRATIONS
WAVES
A wave is a disturbance or vibration which
propagates along a medium or space with transferred energy by one point to
another point, while the medium itself does not propagate.
The classifications of
waves :
A. Based on the medium of
propagation
1. Mechanical wave
A wave that
needs a medium in which the wave propagates.
Examples :
string wave, ocean wave, sound wave, etc.
2. Electromagnetic wave
A wave does
not need any media to propagates.
Examples : light waves,
radio waves, micro waves, X-rays, etc.
The Amplitude (A) of a wave is the distance between
peak and the balance point of a wave or the distance between the valley and the
balance point of a wave.
The Wavelength is
the length for one complete wave.
The Frequency (f ) of a wave is the number of waves
generated every second.
The Period (T) of a wave is the time needed to make one complete wave.
2. Longitudinal wave
Longitudinal
wave is wave has a vibration direction to the direction of wave propagation.
Examples : sound waves,
tsunami waves, ultra sounds, vibrations in gas, and oscillations in spring, and waves in slink, etc.
A compression is a region in a longitudinal wave where the particles
are closest together.
A rarefaction is a region in a longitudinal wave where the particles
are furthest apart.
One complete wave is a wave which consists of
one rarefaction and one compression of the wave.
The Wavelength
is the
distance between two consecutive compressions or between two consecutive
rarefactions.
Speed of wave
Wave speed (v )
is the distance a wave
travels per unit time.
Bibliography
Team.2010.SCIENCE for Junior
High School Grade VIII 2nd Semester. Jakarta: Erlangga.
Volunteer and Siyavula.
2010. Everything Science Grade 10 Physical Science. South Africa : http://everythingscience.co.za/grade-10/science/grade-10/everything-science-grade-10.pdf
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