1. The problem statement, all variables and given/known data A certain organ pipe, open at both ends, produces a fundamental frequency of 275 Hz in air. If the pipe is filled with helium at the same temperature, what fundamental frequency f 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. 2. Relevant equations below 3. The attempt at a solution v(he)=999 m/s v(O)=344 m/s I solved with [tex]fn = n v / 2 L[/tex] but I am not getting as accurately of an answer as id like. How can I incorporate the molar mass into these equations?