True. A decibel (dB) is indeed the unit used to express the intensity of sound. It is a logarithmic unit that measures the ratio of the power of a sound wave to a reference level. The reference level is usually set to the threshold of human hearing, which corresponds to 0 dB. The decibel scale is logarithmic because the human perception of sound is also logarithmic. This means that a change of 10 dB represents a tenfold increase or decrease in sound intensity.
True. A decibel (dB) is the unit used to express the intensity of sound.
