- #1
mooncrater
- 217
- 18
Homework Statement
A closed organ pipe resonates in its fundamental mode at a frequency of ##200Hz## in ##O_2## at a certain temperature. If the pipe contains 2 moles of ##O_2## and 3 moles of ##O_3## are now added to it, then what will be the fundamental frequency of same pipe at same temperature?
[Given answer is ##172. 7Hz##]
Homework Equations
The relevant equation according to me is:
##v =√(\gamma P/\rho) ## (in a gas speed of a wave)
The Attempt at a Solution
What I did is:
Velocity of a wave in a gas=
$$v=√(\gamma P/\rho)$$
So using ##v=\nu\lambda##
We can say that
##\nu_1/\nu_2=√(\rho_2/\rho_1)##
And we know that
##\rho_1=4×16/V ## where V is the volume of pipe
And ##\rho_2=3×3×16+2×2×16/V=13×16/V##
Therefore my frequency is coming out to be
##110 Hz##
Which is wrong.. I know the whole of this seems to be wrong from the start... so how to do this?