level falls slowly as water is pumped out of it from a valve at a constant volume rate dV/ dt. A small speaker is mounted near the opening of the water, sending a sound wave of frequency f down the tube. As the water level falls, one hears a resonance from the tube every N seconds. (a) Take the speed of sound as v = 340 m/s and f= 1700 Hz, what is the wavelength ) of the sound wave from the speaker? (b) If N = 8.0 (i.e., a resonance is heard every 8.0 seconds), how fast must the water level in the tube be falling? (c) Take A= 4.50 cm', find dV/ dt