Question

Name the unit used to measure the sound level:

• A. decibel
• B. Hz
• C. watt
• D. joule

Answer 1

The correct option is A decibel

Sound level, or, Loudness of sound is a measure of response of sound to our ear. Loudness of sound is not simply the energy reaching the human ear, but it also tells about the sensitivity of human ear detecting this energy. Loudness of sound is measured in decibel (dB).
As energy reaching the ear depends on square of amplitude, loudness of sound depends on various factors namely, amplitude of sound waves sensitivity of ear, distance from the source of the sound, etc.