A group of physics students set a tuning fork of 500 Hz just above a big cooking pot. The tuning for is struck and continues to ring throughout the experiment. The students pour water into the pot until they hear the resonance. The pot's length of 0.2 tall, and the wavelength of the resonance is 0.8. The speed of the sound in this experiment is 400 m/s.

1. You may discover that the speed of sound seems a bit off. Write down some ideas on why that is.