AP Physics 1 Question 411: Answer and Explanation
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9. What is the difference between the wavelengths of the 3rd and 4th harmonics of a standing wave fixed at both ends?
Correct Answer: C
The harmonic wavelengths of standing waves fixed at both ends are given by the equation . The wavelength of the third harmonic then is , and the wavelength of the fourth harmonic is . The difference between the wavelengths of these two harmonics is equal to .