WAEC Physics 2017 Objective — Question 24
Question 24 of 50 from the West African Examinations Council (WAEC) Physics 2017 Objective paper, with the correct answer and a full explanation.
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A certain wave has a speed of 20 ms⁻¹. If the frequency of the wave is 0.25 Hz, calculate the distance between successive crests of the wave.
- A. A. 5.0 m
- B. B. 40.0 m
- C. C. 50.0 m
- D. D. 80.0 mCorrect
Explanation
Given: speed of wave (v)=20 m/s; frequency of wave (f)=0.25Hz; wavelength=distance between successive crests. v=fλ => λ=v/f=20/0.25=80m.
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