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.
Pitch- the relative âhighnessâ or âlownessâ of a sound- In science, the pitch is called the Frequency, and is measured in Hertz (Hz), which corresponds to the number of cycles (waves) per second (ie, A440 is a soundwave that vibrates 440 times in a second)