Some taxes are inadvertently hidden, but others are consciously designed that way to disguise the cost of government. Itâs easy to see why: the total U.S. tax burden is equal to 56 percent of annual personal consumption spending.
Thus, the volume is proportional to the amplitude of the sound wave. The frequency of a sound wave is perceived as pitch. Humans can detect pitches within the acoustic range of 20 to 20,000 Hz, but we can't detect ultrasound or infrasound.
Something that is vibrating quickly is said to have a high frequency, something that is vibrating slowly is said to have a low frequency. 5. A Hertz is a measure of frequency. One Hertz is one vibration per second. 6. One half a time. The swing would swing forward or backward in one second. It would not go back and forth. 7.