Decibel
Coulomb
Hum
Cycles
Answer is Wrong!
Answer is Right!
The correct answer is A. Decibel.
A decibel (dB) is a logarithmic unit that expresses the ratio of a physical quantity (such as sound pressure) to a reference value. The reference value for sound pressure is 20 micropascals (μPa), which is the threshold of human hearing. A
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