【Daily Question】Theoretical Foundation 2020.05.22
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Multiple-choice question: A very long rope is stretched horizontally; one end of it is held by hand, with the pulling force kept constant, causing the end of the rope to perform simple harmonic motion in a direction perpendicular to the rope. Then ( ) (A) the higher the vibration frequency, the longer the wavelength. (B) the lower the vibration frequency, the longer the wavelength. (C) the higher the vibration frequency, the greater the wave speed. (D) the lower the vibration frequency, the greater the wave speed. Answer: B Hint: Those who can explain the solution process will receive an additional reward; the answer can be found in the response!
B. Explanation: The wave speed u = λv, where λ is the wavelength and v is the frequency. The wave speed depends only on the medium; therefore, it remains constant, while the wavelength and frequency are inversely proportional to each other.