Concept:Wavelength is strictly defined as the physical distance required for one complete wave cycle (one full crest and one full trough).
Solution:- The provided diagram features an arrow spanning a total distance of exactly 2 meters.
- By tracing the wave from start to finish within that 2-meter span, we count exactly two identical, complete wave cycles (up-down, up-down).
- To find the length of a single cycle (wavelength, \( \lambda \)), divide the total distance by the number of cycles: \( \lambda = \frac{2 \text{ m}}{2 \text{ cycles}} \).
- Therefore, \( \lambda = 1 \text{ m} \).
Why other options are incorrect:Option A (2m) is the trap for students who assume the provided spatial label automatically represents exactly one wavelength without counting the underlying cycles.
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