题目内容

A plane simple harmonic wave propagates in an elastic medium. in the process of a certain mass element (某质元) moving from the equilibrium position to the maximum displacement, .

A. its kinetic energy is converted into potential energy
B. its potential energy is converted into kinetic energy
C. It gains energy from adjacent (相邻的) mass elements and its energy gradually increases.
D. It passes its energy to adjacent (相邻的) mass elements and its energy gradually reduced.

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