440 C per S in a P ALetter Equations are well known phrases or facts where the key words have been replaced with the first letter of that word. These are often in the form of an equation, which contain a number, an = sign and the rest of the obscured phrase or fact.
440 C per S in a P A
Answer440 Cycles per Second in a Perfect A
In music, an "A" note is considered to be at the perfect pitch when it vibrates at 440 cycles per second.
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