As the noise level increases, the decibel level ___.

• A. increases
• B. decreases
• C. remains constant
• D. fluctuates

Answer: (A)

Sound levels are measured in decibels on a logarithmic scale, so when the actual noise increases, the decibel value increases as well. Decibels express how much sound energy or pressure there is relative to a reference level; because the scale is logarithmic, any rise in noise leads to a higher dB reading (a doubling of energy roughly adds about 3 dB, and doubling pressure about 6 dB). Therefore, as noise grows, the decibel level goes up.

It wouldn’t decrease, stay constant, or merely fluctuate due to the increase — those outcomes would contradict how decibels quantify loudness.