Wavelength and frequency
2 marks · NormalA student uses a ripple tank to produce waves with a wavelength of 0.04 m. The tank's motor produces 25 waves every second. Calculate the speed of the water waves.
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1.0 m/s (±0.02)
Also accept: 0.04 × 25 = 1 m/s
Common mistakes: 25 / 0.04 = 625 m/s
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Marking points
M1 · 1 mark · Substitutes frequency and wavelength into v = f × λ
A1 · 1 mark · Correct answer: 1.0 m/s
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