The wave equation
2 marks · NormalThe table shows properties of three waves traveling with the same speed.
| Wave | Frequency (Hz) | Wavelength (m) |
|---|---|---|
| A | 10 | 2.0 |
| B | 4 | 5.0 |
| C | 20 | 1.0 |
(a)[2 marks]
Which two waves have the same wave speed? Give your answer using wave letters.
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A and B
(a) A and B
Also accept: B and A
Show mark scheme and worked solution
Marking points
M1 (a) · 1 mark · Calculates wave speed for at least two waves using v = f × λ.
A1 (a) · 1 mark · Correctly identifies the pair with equal speeds (A and B).
Worked solution
Wave speed for A: 10 × 2.0 = 20 m/s
Wave speed for B: 4 × 5.0 = 20 m/s
Waves A and B have the same wave speed.