The Intensity at a Distance of 6

question 171

Multiple Choice

The intensity at a distance of 6.0 m from a source that is radiating equally in all directions is 6.0 × 10-10 W/m2. What is the intensity level in dB? The threshold of human hearing is 1.0 × 10-12
W/m2.

• A) 23 dB
• B) 28 dB
• C) 18 dB
• D) 32 dB

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Definitions:

Squareness

The degree to which two surfaces or lines form a perfect 90-degree angle, indicating precision and alignment.

Roundness

A geometric tolerance that limits the amount by which the surface of a part can deviate from a perfect circle.

Flatness

A geometric tolerance that specifies the maximum allowable deviation of a surface from being perfectly flat.

Geometric Tolerance

The maximum permissible deviation in shape and location for a geometric element.