progressive waves travel waves or and they
TRANSCRIPT
WAVES
Typesof waves1 Progressive waves
waves which travel or move and as theymove theytransferenergy from one pointtoanother
is Transverse Direction ofvibration is perpendicular to thedirection in which the wave travels
ii longitudinal Thedirection of vibration isparallel to thedirection in which the wave travels
PROPERTIES OF WAVES1 Reflection2 Refraction 0levelscontent
3 Superposition4 Interference5 Diffraction
ASlevelcontent
TERMINOLOGY
PathDifferenceRefersto thedistance between any two points on a wavemeasured in terms ofwavelength x
9i
l x these are path differences
I
Ex
PhaseDifferenceReferstodistance between anytwo points on a wave measuredeither indegrees o or in radians1rad
360 or 27
iii i
ii
ii i180 or Tl 5400 or 37
Apathdifferenceof one Lonewavelength corresponds to aphasedifferenceof 360 or 27radians
in PhasePointsTwopoints if upon comparison exhibit identicalbehaviour thenthey are said to be in phase with eachother
Examplescouldbe a crest if compared with another crestORa trough if compared with another trough
In phase pointsmust have a pathdifference of 1 x 2x 3 xnX where n is an integervalue
AND Theymust have a correspondingphasedifference of Za4IT 671 ha where n is an integermultipleof 2
Outof PhasepointsTwo points if upon comparison exhibitexactlyopposite behaviourthen they are said to be out of phase with each otherExample couldbe a crest if compared to a troughFor out of phasepoints they must have a pathdifferenceoff X EX EX n where n is an odd integer
And theymust have a correspondingphasedifferenceofTl 3 a Sa n a where n is an oddinteger