wave characteristics and properties
Post on 30-Jul-2015
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What is a wave?
A wave is a disturbance propagated from one place to another with no actual
transport of matter
Transverse waveDisplaces particles
perpendicular to the motion of the wave
https://upload.wikimedia.org/wikipedia/commons/b/b6/Wave_in_a_rope.png
Longitudinal waveCause the particles of a
medium to move parallel to the direction of motion of
the wave
http://3.bp.blogspot.com/-iV7FuAhDdiY/TZMZS7G75tI/AAAAAAAAACc/Ds700IGPvVA/s1600/Longitudinal+Wave.jpg
Longitudinal wave
Has a crowded area causing a high-pressure
region called compression, and the opposite is rarefaction
Periodic motionThe repetitive motion of a particle about the
equilibrium position caused by a restoring force when it is displaced
Simple Harmonic Motion (SHM)
within the elastic limit, the distortion in an object is directly proportional to the distorting force
If the restoring force obeys Hooke’s law, then the resulting vibration is called Simple Harmonic Motion
(SHM)
Hooke’s law
Periodic Wave Characteristics
Wavelength (λ)The distance from crest to crest (or trough to trough);
expressed in meters
Periodic Wave Characteristics
Amplitude (A)The distance of crest (or trough) from the midpoint of
the wave
Periodic Wave Characteristics
Frequency (f)The number of waves that passed a fixed point per
second; measured in hertz (Hz)
Periodic Wave Characteristics
Period (T)The time it takes a wave to travel a distance equal to
a wavelength; measured in second
T= 1/f
Periodic Wave Characteristics
Wave velocity (v)distance travelled by a wave crest in one period
v= λ/T
Constructive interference
Destructive interference
Two interacting waves are in-phase
Two interacting waves are out-of-phase
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