The standard reference sound level is about:
A)the threshold of human hearing at 1000 Hz
B)the threshold of pain for human hearing at 1000 Hz
C)the level of sound produced when the 1 kg standard mass is dropped 1 m onto a concrete floor
D)the level of normal conversation
E)the level of sound emitted by a standard 60 Hz tuning fork

Question

Quizplus · Accepted Answer

The standard reference sound level is usually defined as 0 decibels (dB) at a sound pressure level of 20 micropascals, which is the threshold of human hearing at 1000 Hz.

The Standard Reference Sound Level Is About