An outside loudspeaker (considered a small source) emits sound waves with a powe

Question

An outside loudspeaker (considered a small source) emits sound waves with a power output of 75 W.

An outside loudspeaker (considered a small source) emits sound waves with a power output of 75 W. Find the intensity 8.0 m from the source. Find the intensity level in decibels at that distance. At what distance would you experience the sound at the threshold of pain, 120 dB? A noisy machine in a factory produces a decibel rating of 71 dB. How many identical machines could you add to the factory without exceeding the 90 dB limit? A skyrocket explodes 100 m above the ground (Fig. P14.18). Three observers are spaced 100 m apart, with the first (A) directly under the point of the explosion. What is the ratio of sound intensities heard by observer A to that heard by observer B? What is the ratio of intensities heard by observer A to that heard by observer C?

Explanation / Answer

. Dividing the power by the surface area of a sphere at a distance R = 8 meters.

(a)?75 ? (4?R

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