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Let l be the length of a string. Find the wavelength of the standing wave.

1. λ = l/2
2. λ = 2l
3. λ = l
4. λ = l/4

Correct answer: λ = 2l

Solution

In a standing wave, the wavelength λ is related to the length of the string l. For the fundamental mode (first harmonic), the wavelength is twice the length of the string, i.e., λ = 2l.

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