Hearing is expressed in decibels (dB), or units of loudness. Which is the softest sound a normal ear can hear?
A) 0 dB
B) 10 dB
C) 40 to 50 dB
D) 100 dB

Question

Quizplus · Accepted Answer

By definition, 0 dB is the softest sound the normal ear can hear. Ten decibels is the sound of the heartbeat or the rustling of leaves. 40 to 50 dB is in the range of normal conversation. The noise of a train is approximately 100 dB.

Hearing Is Expressed in Decibels (DB), or Units of Loudness