What beat frequency do you hear when two sounds one at 240 hz and the other at 243 hz occur at the same time?

When two sounds at frequencies of 240 Hz and 243 Hz occur simultaneously, the beat frequency is determined by the difference between the two frequencies. In this case, the beat frequency is 243 Hz - 240 Hz, which equals 3 Hz. This means you would hear a fluctuation in volume at a rate of 3 beats per second.