Redefining Dementia as a Terminal Illness. Dementia is most often thought of as a memory disorder, an illness of the aging mind. In its initial stages, that's true â memory loss is an early hallmark of dementia. But experts in the field say dementia is more accurately defined as fatal brain failure: a terminal disease, like cancer, that physically kills patients, not simply a mental ailment that accompanies older age.
Frequency is measured in the number of sound vibrations in one second. A healthy ear can hear sounds of very low frequency, 20 Hertz (or 20 cycles per second), to a very high frequency of 20,000 Hertz. The lowest A key on the piano is 27 Hertz. The middle C key on a piano creates a 262 Hertz tone. The highest key on the piano is 4186 Hertz.
The derived SI unit for frequency is hertz (Hz) The common metric multipliers are: kilohertz (kHz) = 1,000 Hz Megahertz (MHz) = 1,000,000 Hz and Gigahertz (GHz) = 1,00 â¦ 0,000,000 Hz. 15 people found this useful. Pitch and frequency both are measured in simple hertz.