The left column shows the guitar string shape as a sinusoidal traveling wave pas

Question

The left column shows the guitar string shape as a sinusoidaltravelingwave passes through it. Notice that the shape is sinusoidal at all times and specific features, such as the crest indicated with the arrow, travel along the string to the right at a constant speed.

The right column shows snapshots of the sinusoidalstandingwave formed when this sinusoidal traveling wave passes through an identically shaped wave moving in the opposite direction on the same guitar string. The string is momentarily flat when the underlying traveling waves are exactly out of phase. The shape is sinusoidal with twice the original amplitude when the underlying waves are momentarily in phase. This pattern is called astandingwave because no wave features travel down the length of the string.

Explanation / Answer

each "bump" of a standing wave is half a wavelength, and in your picture this is 20cm
So the wavelength is twice this, or 40 cm

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