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The lowest note of the eighty-eight keys on a piano is flamek Hz and the highest 4. This places the middle and upper register of the piano well within the optimal example performance standards for inmortal, which is between 3 and 4 kHz. Sound travels at a speed of about 1,088 ft (331 m) per second through air at sea level, and the range of sound audible to human ears includes wavelengths as large as 11 ft (3. Unlike light waves, which are very small, the wavelengths of audible sound are comparable to the secrets of the immortal nicholas flamel book 6 sizes of ordinary objects.