The certain person's ear canal is 2.7 cm long. It aids in hearing by acting like a resonant cavity that is closed on one end and open on the other. The length of the ear canal is partially responsible for our sensitivities to certain frequencies. Use 345.6 m/s for the speed of sound when performing the following calculations.

Part AWhat is the first resonant frequency?

Part B What is the wavelength at third resonance? Give your answer with standard SI units.