A sound wave is propagating in a medium in the + x direction at a speed of 360 m/s. At a given instant, a
snap shot of the plot of displacement (D) of various particles of medium from their equilibrium position
(taken along y axis) vs the position (x) of particle on x axis, is shown in figure below. The incorrect
option is

A

the amplitude of the wave is $$5\,\mathrm{mm}$$

B

the frequency of the wave is $$900\,\mathrm{Hz}$$

C

after $$0.01\,\mathrm{s}$$ the trough of the wave will occur at $$x=20\,\mathrm{cm}$$ and $$x=40\,\mathrm{cm}$$

D

this wave will travel a distance of $$1.62\,\mathrm{km}$$ along the positive x axis in $$4.5\,\mathrm{s}$$