WAEC Physics 2015 Objective — Question 24

Question 24 of 50 from the West African Examinations Council (WAEC) Physics 2015 Objective paper, with the correct answer and a full explanation.

In the diagram above (displacement-time graph, t = 0.6 s, x = 9 m), determine the speed of the wave.

• A. 5.4 ms⁻¹
• B. 8.4 ms⁻¹
• C. 9.6 ms⁻¹
• D. 10.0 ms⁻¹Correct

Explanation

The period T = 0.6/2 = 0.3 s (0.6 s spans two cycles) and the wavelength λ = 9/3 = 3 m (3 complete waves shown). Speed v = λ/T = 3/0.3 = 10.0 ms⁻¹.

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