The Standard Reference Sound Level Is About

question 67

Multiple Choice

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

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