The longitudinal displacement of a mass element in a medium as a sound wave passes through it is given by s = Sm Cos (kx - wt). Consider a sound wave of frequency 440 Hz and wavelength 0.75m. If Sm = 12 um, what is the displacement of an element of air located at x = 1.2 m at timet 0.11 s? O 3.7 um O 4.9 um O 6.0 um O 8.2 um O 12 um

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