When you increase the amplitude slider in a wave simulation, the correct answer is: A. The wave appears taller (greater height).
Increasing the amplitude of a wave means that the height of the wave from its rest position increases, which results in a wave that looks taller. The frequency (B) refers to how many cycles occur in a given time, which does not inherently change with amplitude. The speed of the wave (C) is determined by the medium it travels through and also does not change just due to an increase in amplitude. The wave will not disappear (D) as a result of increasing amplitude.
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