The wave equation

2 marks · Normal

The table shows properties of three waves traveling with the same speed.

(a)

Which two waves have the same wave speed? Give your answer using wave letters.

[2 marks]

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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.