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Finding the Beat Frequency with Two Given Wavelengths

WAVES-KY@HDB

Two dolphins are communicating with each other by producing a two distinct tones. The first tone has a wavelength of $1.63m$ and the second tone has a wavelength of $1.60m$.

Given that the speed of sound in this particular body of salt water is $1460m/s$, what is the beat frequency that a nearby submarine will hear?