1. The problem statement, all variables and given/known data The longitudinal displacement of a mass element in a medium as a sound wave passes through it is given by s = sm cos (kx – ωt). Consider a sound wave of frequency 330 Hz and wavelength 0.95 m. If sm= 16 µm, what is the displacement of an element of air located at x = 1.1 m at time t = 0.12 s? 2. Relevant equations k=2π/λ ω=2πƒ ƒ≡ frequency ω≡ angular frequency λ≡ wavelength k≡ angular wave number 3. The attempt at a solution substitute the values of λ and f in k and ω to get k=6.6138 m^-1 and ω=2073.45 ∴ s= 16 cos ( 6.6138*1.1-2073.45*0.12)=-7.625 INCORRECT Where I made mistake?