The distance between one trough and the next trough in a wave is known as the wavelength. Based on your options, if the illustration depicts the distance between two consecutive troughs, you would measure that distance directly from the diagram to determine the correct answer.
However, without seeing the illustration, I cannot provide a definitive answer. If you know the specific measurements shown in the illustration, you can select the correct distance based on those values. But if you need to select an answer from the choices provided, you’ll have to refer to the diagram to ascertain which of the distances (20 cm, 6 cm, 12 cm, or 50 cm) accurately represents the distance between the troughs.
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