A Harmonic Longitudinal Wave Propagating Down a Tube Filled with a Compressible

Multiple Choice

A harmonic longitudinal wave propagating down a tube filled with a compressible gas has the form s(x,t) = s_m cos (kx - $\omega$ t) .Its velocity can be obtained from

A) $\omega$ /k
B) k/ $\omega$
C) k
D) $\omega$
E) $\omega$ k