A Sound Wave Radiates from a Source in All Directions

question 61

Multiple Choice

A sound wave radiates from a source in all directions.If the power of the sound source is 200 watts,then the intensity of the sound wave 100 m from the source is

• A) 2.2 milliWatts/m².
• B) 2.0 milliWatts/m².
• C) 1.8 milliWatts/m².
• D) 1.6 milliWatts/m².
• E) 1.2 milliWatts/m².

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Definitions:

Shingles

A viral infection caused by the varicella-zoster virus, leading to a painful rash, usually on one side of the body or face.

Cornea

A transparent area on the front of the outer layer of the eye that acts as a window to let light into the eye.

Pupil

The opening at the center of the iris, which grows smaller or larger as the iris contracts or relaxes, respectively; it regulates the amount of light that enters the eye.

Lens

A clear, circular disc located in the eye, just posterior to the iris, that can change shape to help the eye focus images of objects that are near or far away.