Wavelength and frequency
2 marks · NormalDescribe two observations that show how increasing the frequency of a ripple tank motor changes the pattern of waves seen.
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The wavelength of the waves becomes shorter and there are more wavefronts per unit length.
Also accept: Waves become closer together; wave pattern becomes more frequent
Common mistakes: Waves get taller
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Marking points
B1 · 1 mark · Correctly states that wavelength decreases/waves are closer together
B2 · 1 mark · Correctly states more waves (wavefronts) appear per unit length, or frequency increases
Worked solution
As frequency increases, (1) the wavelength shortens (waves get closer together), and (2) more wavefronts are visible in the same space.