Well ads I remember, the motion of the gas particles is random and in a straight-line. A sample of gas is contained in a closed rigid cylinder.
And here is what I found too -
According to Kinetic Molecular Theory, gaseous particles are in a state of constant random motion; individual particles move at different speeds, constantly colliding and changing directions. We use velocity to describe the movement of gas particles, thereby taking into account both speed and direction.
Wavelength= velocity/frequency wavelength= (3.0 x 10^8m/s) / 7.5 x 10^12 Hz) you can do the math I am assuming u that 108 is 10^8 and the 1012 is 10^12
