WAEC Physics 2018 Objective — Question 35
Question 35 of 50 from the West African Examinations Council (WAEC) Physics 2018 Objective paper, with the correct answer and a full explanation.
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A wire of length 400cm is stretched between two fixed points. When plucked, its fundamental frequency is 150Hz. Calculate the speed of the wave produced.
- A. 250ms⁻¹
- B. 625ms⁻¹
- C. 1200ms⁻¹Correct
- D. 1500ms⁻¹
Explanation
For a string fixed at both ends, wavelength of the fundamental λ = 2L = 8m. Speed v = fλ = 150×8 = 1200ms⁻¹.
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