What is the formula for calculating wave speed through a gas?

[road_runner]

I tried finding lambda:
.03 = wavelength/2 --> wavelength = (.03)(2) = .06

Then plugging that into the equation
v = (frequency)(wavelength) --> v = (11996)(.06) = 719.76

But that didn't work.

 

[collinsmark]

Hello road_runner,

Welcome to Physics Forums!

I tried finding lambda:
.03 = wavelength/2 --> wavelength = (.03)(2) = .06

[...]

But that didn't work.

Reevaluate the comparative length of the path LYM, when the section is pulled out by 0.03 m. The LYM section can be broken up into two parts: the length of the top part and the length of the bottom part.

When the sliding section is pulled out, the LYM distance increases by 0.03 m due to the increase in length of the top part, and yet another 0.03 m care of the bottom part.

 

[road_runner]

Ahhh ok! Thanks a million! Never even considered that the length changes in both parts...