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## Homework Statement

A certain organ pipe, open at both ends, produces a fundamental frequency of 291 Hz in air.

If the pipe is filled with helium at the same temperature, what fundamental frequency f

_{He}will it produce? Take the molar mass of air to be 28.8 g/mol and the molar mass of helium to be 4.00 g/mol.

## Homework Equations

f

_{He}= v/[tex]\gamma[/tex]

[tex]\gamma[/tex] = 2 L

## The Attempt at a Solution

Honestly, I have no idea what to do with this problem so I have no attempt. I was completely thrown off my the molar masses because I haven't seen a problem like this before. I'm not even sure if these are the right formulas for this problem.