【Daily Question】Theoretical Foundation 2020.05.23
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Multiple-choice question: Among the following statements, which one is correct? ( ) (A) When the wave source remains stationary, the vibration period of the wave source is numerically different from the period of the wave. (B) The velocity of the wave source’s vibration is the same as the wave speed. (C) The vibration phase of any particle in the direction of wave propagation is always lagging behind the phase of the wave source. (D) The vibration phase of any particle in the direction of wave propagation is always ahead of the phase of the wave source. Answer: C Hint: An extra reward will be given to those who can explain the solution process; the answer can be seen there!
C Analysis: The wave equation is derived from the vibration equation; therefore, when the wave source remains stationary, the vibration period of the wave source is numerically identical to the period of the wave
D) The vibration phase of any particle in the direction of wave propagation is always ahead of the phase of the wave source