Bonpoc 13 0.67 / 0.67 pts Two speakers are 80 cm apart. The speakers both emit precisely the same pure tone in all directions (i.e. same frequency, same amplitude, and emitted with same phase). Mikey is standing on the line joining the two speakers to one side of both of them, and he hears no sound. As the frequency of both speakers is slowly tripled, Mikey hears the sound become quite loud before going silent again. What was the original sound frequency in Hz? Assume the standard speed of sound. 2144 214.4 (with margin: 10.72)