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WAEC Physics 2021 Objective — Question 26

Question 26 of 50 from the West African Examinations Council (WAEC) Physics 2021 Objective paper, with the correct answer and a full explanation.

26. Determine the speed of the wave.

Diagram for question 26

A. 64 cm s⁻¹
B. 32 cm s⁻¹
C. 24 cm s⁻¹
D. 72 cm s⁻¹Correct

Explanation

Speed v=fλ=λ/T=9/0.125=72 cm s⁻¹.

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