A sound wave is traveling in seawater, where the adiabatic bulk modulus and density are $2.31 \times 10^{9} \mathrm{~Pa}$ and $1025 \mathrm{~kg} / \mathrm{m}^{3}$, respectively. The wavelength of the sound is $3.35 \mathrm{~m}$. A tuning fork is struck underwater and vibrates at $440.0 \mathrm{~Hz}$. What would be the beat frequency heard by an underwater swimmer?