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types of wave
transverse:
wave perpendicular to the direction of vibration
longitudinal:
wave parallel to the direction of vibration

properties of transverse wave
crest: highest point
trough: lowest point
amplitude: max. displacement
wavelength: distance btwn 2 crest/trough
wave speed formula
V = f x wavelength
frequency
number of complete wave per second
SI unit = Hz
freq = 1/period
period
time taken to produce a wave
SI unit = s
period = 1/freq

wavefront
imaginary lines joining all adjacent points that are in phase