When a longitudinal wave propagates through a medium, the particles of the medium execute simple harmonic oscillations about their mean positions. These oscillations of a particle are characterised by an invariant

Options

A. Kinetic energy (K)
B. Potential energy (U)
C. `(K - U)`
D. `(K + U)`

Answer

D

Explanation

The particles of the medium executing S.H.M. They have different potential and K.E. at different points. But their total energy `(P.E + K.E)` remains constant at all points or it is an invariant or `(K + U)` is an invariant