WAEC Physics 2021 Objective — Question 25

Question 25 of 50 from the West African Examinations Council (WAEC) Physics 2021 Objective paper, with the correct answer and a full explanation.

25. The sketched graph above represents a progressive wave moving from left to right. The period of the wave is 0.125 s. Determine the values of the amplitude and wavelength respectively of the wave.

A. 8 cm; 27 cm
B. 8 cm; 9 cmCorrect
C. 4 cm; 9 cm
D. 16 cm; 27 cm

Explanation

Amplitude = half the peak-to-peak height = 16/2 = 8 cm. The 27 cm shown spans 3 wavelengths, so wavelength = 27/3 = 9 cm.

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