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.
Hertz: The Number of Waves Per Second. We also measure the number of cycles (wavelengths) per second to determine a wave's frequency, and this also gives us an idea about the level of energy being transmitted.Frequency is measured by a unit called hertz (Hz), named in honor of Heinrich Hertz.ertz: The Number of Waves Per Second. We also measure the number of cycles (wavelengths) per second to determine a wave's frequency, and this also gives us an idea about the level of energy being transmitted.