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Some instruments only have the range to play 2 or 3 octaves, whereas a piano with its 88 keys can play 7 octaves -- 1200 chords in the lowest octave, 1200 chords in the next octave, 1200 chords in the next octave, and so on up to the top octave of the keyboard.
If the tuning fork corresponds to middle C on the piano keyboard, then the tines are vibrating at a frequency of 256 Hertz (or 256 vibrations per second). We are unable to visibly detect vibrations of such high frequency. The pitch (or frequency) of the sound wave is determined by the length of the prongs.