The loudness of sound is measured in which unit?

Correct option is A

The correct answer is (a) Decibel (dB).
· Loudness of sound is measured in decibels (dB), which is a logarithmic unit used to quantify the intensity of sound as perceived by the human ear.
· The decibel scale is a relative scale that compares the intensity of a sound to a reference level (usually the threshold of hearing, which is 0 dB).
· Higher decibel levels correspond to louder sounds, with normal conversation typically around 60 dB and levels above 85 dB potentially harmful to hearing if sustained over long periods.
Information Booster:
Watt/sq. Metre (w/m²):
· A unit of sound power intensity, but not commonly used to express the loudness of sound.
Hertz (Hz):
· A unit of frequency, measuring the number of sound wave cycles per second.
· It determines the pitch of a sound but not its loudness.
Sound Intensity:
· Refers to the amount of sound energy passing per unit area but is typically expressed in watts per square meter (W/m²) rather than loudness.