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Physics / Physics with MasteringPhysics 4 / Chapter 14 / Problem 37P

Physics with MasteringPhysics | 4th Edition | ISBN: 9780321541635 | Authors: James S. Walker

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Problem 37P

Residents of Hawaii are warned of the approach of a tsunami by sirens mounted on the tops of towers. Suppose a siren produces a sound that has an intensity level of 120 dB at a distance of 2.0 m. Treating the siren as a point source of sound, and ignoring reflections and absorption, find the intensity level heard by an observer ata distance of (a) 12 m and (b) 21 m from the siren, (c) How far away can the siren be heard?

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QUESTION:

Problem 37P

Residents of Hawaii are warned of the approach of a tsunami by sirens mounted on the tops of towers. Suppose a siren produces a sound that has an intensity level of 120 dB at a distance of 2.0 m. Treating the siren as a point source of sound, and ignoring reflections and absorption, find the intensity level heard by an observer ata distance of (a) 12 m and (b) 21 m from the siren, (c) How far away can the siren be heard?

ANSWER:

Step 1 of 4

We have to calculate the intensity in dB and distance.

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