That would be 1200 Hz. Every octave is a superposition of the note below it, so the frequency doubles. The octaves above that would be 2400 Hz, 4800 Hz, and so on...
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If middle C is 513 hz (which it is not), then A above would be 513*23/4 = 862.8 hz.
frequency [Hz] = velocity[m/s] / wavelength [m] frequency [Hz] = 24 [m/s] / 3 [m] frequency = 8 [Hz]
Hertz(Hz)
Frequency = reciprocal of period = 1/P = 1/0.008 = 125 Hz.
Hz is short for hertz. It is not a time, but a frequency. Time is measured in seconds, Hz is equivalent to 1/seconds. Therefore, you can't convert between time and frequency.