WAEC Physics 2014 Objective — Question 31

Question 31 of 50 from the West African Examinations Council (WAEC) Physics 2014 Objective paper, with the correct answer and a full explanation.

The diagram illustrates an electromagnetic wave traveling with speed 3.0×10⁸ ms⁻¹, spanning a distance of 0.4m. Calculate the wavelength of the wave.

• A. 0.1m
• B. 0.133mCorrect
• C. 0.2m
• D. 0.4m

Explanation

From the diagram, three complete wave cycles span the marked distance of 0.4m, so wavelength = 0.4m/3 ≈ 0.133m.

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