Which of the below is often used to identify the intensity level of sound?

The intensity level of sound is measured in decibels (dB). The decibel scale is a logarithmic scale used to express the ratio of a particular sound intensity to a reference intensity, typically the threshold of hearing. This allows for a wide range of sound levels to be represented in a manageable and comprehensible format, as human hearing can perceive a vast range of sound intensities. The relationship between sound intensity and perceived loudness is not linear; hence, the decibel scale effectively captures this complexity.

For example, an increase of 10 dB represents a tenfold increase in sound intensity, which correlates to a perceived doubling of loudness by the human ear. This makes decibels the standard unit for measuring sound levels in various contexts, from everyday sounds to scientific and industrial noise assessments.

The other options do not measure sound intensity levels: a meter is a unit of length, a watt measures power (not specific to sound), and a tesla measures magnetic flux density. Each of these units serves different physical quantities and is not suitable for quantifying sound intensity.