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compression: pushing force.
Rarefaction:pulling force
ripple tank: a large glass- bottomed tank of water that is used to study wave in two dimensions.
reflection: change in direction of a wavefront at an interface between two different media so the wavefront returns into the medium from which it was origination.
*wavefront:continuous line / surface including all the pint in space reached by a wave or vibration at the same instant as it travels through a medium
Transverse Wave: displacement of the medium is perpendicular to the direction of propagation of the wave e.g)ripple on a pond, wave on a string
refraction: the bending of a wave when it enters a medium where its speed is different.
diffraction: spreading of wave s around obstacels
electromagnetic wave
Longitudinal Wave: displacement of the medium is parallel to the propagation of the wave.
e.g) sound waves in air
Electromagnetic waves: waves that are capable of traveling through vacuum.
*vacuum: region with a gaseous pressure much less than atmospheric pressure.
Wavelength:distance over which the wave repeats.
amplitude:: maximum of extent.
peak: highest point of the wave
trough: lowest point of the wave
period: time required for one complete cycle of vibration to pass a givenpoin.
oscillation: vibration occcured when a system is disturbed fom a position of stable equilibrium
frequency: number of waves that pass a fixed point in a unit.
*unit: Hertz