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A longitudinal wave propagates through a medium. Which of the following, if any, holds true? A....

A longitudinal wave propagates through a medium. Which of the following, if any, holds true?

A. Elements of the medium are displaced perpendicular to the direction of propagation of the wave

B. The wavelength is equal to the product of the propagation speed and the oscillation period

C. Elements of the medium are displaced back and forth along the axis of propagation of the wave

D. The wavelength is equal to the ratio of the propagation speed and the oscillation frequency

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