Water Distribution Grade 1 Certification Practice Exam

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What is the unit of measurement for sound?

Decibels
Hertz
Watts
Deca

The correct answer is: Decibels

The unit of measurement for sound is the decibel. Decibels are used to quantify the intensity or loudness of sound. This measurement allows us to compare different sound levels in a logarithmic scale, which reflects how human hearing perceives loudness changes. For example, a sound that is 10 decibels is perceived as roughly twice as loud as a sound at 0 decibels. Hertz, while also related to sound, measures frequency, which is the number of cycles per second of a sound wave. Watts are units of power, which can be related to sound in terms of how much energy is imparted by a sound source, but they are not a direct measurement of sound itself. Deca is a metric prefix that represents a factor of ten and is not a unit of sound measurement. Understanding these distinctions underscores why decibels are the appropriate choice when discussing sound intensity.