A certain pipe produces a fundamental frequency of 262 Hz in air. (a) If Ihe pipe is filled with helium at the same temperature, what fundamental frequency does it produce? (The molar mass of air is 28.8 g/mol. and the molar mass of helium is 4.00 g/mol ) (b) Does your answer to part (a) depend on whether the pipe is open or slopped’’ Why or why not?

Solution 29E Step 1: Fundamental frequency f A = 262 Hz Molar mass of air M A = 28.8 g/mol Molar mass of air M H = 4 g/mol Problem (a) Step 1: Fundamental frequency of the pipe if it is filled with Helium HM A fH = f A H.M H ( - heat capacity and constant for gases)