What is the frequency of a sound wave traveling through air in a tube?

[Puchinita5]

Homework Statement

A sound wave of the form s = sm cos(kx - ωt + φ) travels at 347 m/s through air in a long horizontal tube. At one instant, air molecule A at x = 2.04 m is at its maximum positive displacement of 6.40 nm and air molecule B at x = 2.08 m is at a positive displacement of 2.10 nm. All the molecules between A and B are at intermediate displacements. What is the frequency of the wave?

Homework Equations

The Attempt at a Solution

uhhh I'm pretty much confused from the get go...i'm not sure how air molecules interact with a wave? i might need to be spoon fed a little here, because i don't even know where to start! ANY HINTS GREATLY APPRECIATED :)

 

[ideasrule]

Sound is basically the vibration of air molecules: as molecules oscillate, they force their neighbors into the same type of motion. Sound being a wave, some air molecules vibrate more than others, like how the middle of a guitar string vibrates more than the string's ends. Need any more hints?

 

[Puchinita5]

ahhh sorry yea, i have NO idea...didn't even know the middle of a guitar string vibrates more than the ends (and totally don't know why)...