The figure is a snapshot graph of two plane waves passing through a region of space. Each wave has a 2.0mm amplitude and the same wavelength. What is the net displacement of the medium at points a, b and c?

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Stretched string

A stretched string is a wire which is made up of any metal that must have a larger length compared to its thickness. The ends of the wire are fixed, and when they oscillate or are plucked, it produces two reflected transverse waves of the same frequency and same amplitude. The waves or pulses are traveling in alternate directions and superimpose with one another. This waveform is named standing or stationary waves.