(a) Compare between longitudinal waves and transverse waves.
(b) The below figure shows the wavefront formed by a straight dipper. A piece of flat triangular Perspex is placed in the tank.
(i) State what happens to the wavelength, the frequency and the speed of the waves as the water waves moves from the dipper and enters the triangular region.
(ii) Using (i), draw, on the figure, the wavefronts as the waves move into the triangular region.
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Answer:
(a) Transverse waves: Vibration is perpendicular to the direction of travel of the waves.
Longitudinal waves: Vibration is parallel to the direction of travel of the waves.
(b)
(i) Wavelength is shorter
Frequency remains the same
Speed of wave is slower
(ii)
Then draw the wavefronts perpendicular to the red lines
