WAEC Physics 2025 Objective — Question 14
Question 14 of 51 from the West African Examinations Council (WAEC) Physics 2025 Objective paper, with the correct answer and a full explanation.
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A vibrator is used to generate ripples in a ripple tank. If the distance between two successive troughs is 3.5cm and the wave travels a distance of 31.5cm in 1.5s, calculate the frequency of the vibrator.
- A. 3.0Hz
- B. 6.0HzCorrect
- C. 9.0Hz
- D. 12.0Hz
Explanation
Speed v = distance/time = 31.5/1.5 = 21 cm/s = 0.21 m/s. λ = 3.5cm = 0.035m. f = v/λ = 0.21/0.035 = 6Hz.
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