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Q.

Which characteristic of sound has unit decibel?


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a

Wavelength

b

Speed

c

Frequency

d

Loudness 

answer is D.

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Detailed Solution

Loudness is the characteristic of sound that has a unit decibel.
The loudness of a sound wave is directly proportional to the square of the wave's amplitude. The loudness of sound is measured in decibels (dB). As a result, the higher the decibels, the louder the sound. A decibel is a logarithmic unit used in electronics and telecommunications.
The smallest unit on a decibel scale is 0 dB, which is equal to silence. If the decibel level increases by ten, the actual increase in sound intensity is ten times greater. Long-term exposure to sounds louder than 85 dB can cause hearing loss.
 
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