1. The problem statement, all variables and given/known data A closed tube filled with air is 50cm long. a. what is the length of an open tube that has the same fundamental frequency? 100cm (34,500cm/s^2 / 2(100cm) b. what is the frequency? 172.5 (34,500cm/s^2 / 4 (50cm) I got these two but, need help on this: c. These two tubes are placed in a gas with a speed of sound grteater than the sound in air. Do the frequencies of their fundamentals remain equal to each other? d. Do they increase or decrease? 2. Relevant equations v/2L (fundamental frequency of the first harmonic, open tube) v/4L (fundamental frequency of the first harmonic, closed tube) L = length of tube 3. The attempt at a solution By CLOSED tube in all these problems - it means closed on ONE SIDE only.