AP Physics 1 Question 456: Answer and Explanation
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4. A string of length 2 m that's fixed at both ends supports a standing wave with a wavelength of 0.8 m. What is the harmonic number of this standing wave?
- A. 3
- B. 4
- C. 5
- D. 6
Correct Answer: C
The length of the string is equal to 2.5λ, so
The expression for the wavelength of the nth harmonic is , so the harmonic number of the standing wave is 5.