Physiology Test Question

When considering sound intensity levels, 0 decibel (dB) refers to:

	(A) the absence of sound.
	(B) a sound intensity level that is at the threshold of hearing for average human beings with normal hearing.
	(C) a sound intensity level that is equivalent to a pressure level of 0.000204 dyne/cm² (2.01 × 10⁻¹⁰ atmosphere).
	(D) the standard sound reference level established by the Acoustical Society of America.

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Posted: Wednesday, November 11, 2015

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