Two waves combine with destructive interference.What must be true of the combined wave that forms? A. It has a higher amplitude than that of the original waves. B. It has a shorter wavelength than that of the original waves. C. It has a lower amplitude than that of the original waves. D. It has a longer wavelength than that of the original waves.

## Step 1: Understanding Destructive Interference<br />### Destructive interference occurs when two waves combine in such a way that they cancel each other out. This happens when the crest of one wave aligns with the trough of another, resulting in a reduction in the overall amplitude of the combined wave.<br />## Step 2: Analyzing the Amplitude<br />### The amplitude of the combined wave is lower because the positive displacement of one wave is canceled by the negative displacement of the other wave. This reduction in amplitude is a key characteristic of destructive interference.<br />## Step 3: Evaluating the Options<br />### Given the nature of destructive interference, the combined wave will have a lower amplitude than the original waves. Therefore, the correct option is the one that states the amplitude is lower.