A speaker produces 100 (w) of power. If the speaker projects sound uniformly into the forward hemisphere, what is the intensity at 4m away from the speaker a) 15.92 w/ m? b) 3.98 w/ m? c) 1.77 w/ m? d) 1.00 w/ m2

A speaker produces 100 (w) of power. If the speaker projects sound uniformly into the forward hemisphere, what is the intensity at 4m away from the speaker a) 15.92 w/ m? b) 3.98 w/ m? c) 1.77 w/ m? d) 1.00 w/ m2

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter17: Sound

Section: Chapter Questions

Problem 128P: An airplane moves at Mach 1.2 and produces a shock wave. (a) What is the speed of the plane in...

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Concept explainers

Shock Waves

Shock waves are common in continuum mechanics, and their dominance is attributable to the fact that they are stronger (or even less) compressible. Substantial perturbations propagated as sudden dynamic changes of a compressible medium supersonically. Shock waves are all around us in our daily lives. Lightning, earthquakes, volcanic eruptions, and meteorite impact all produce them in nature. Even the earth, which is protected by its magnetic field, generates a shock wave as in solar wind that travels around 20 Earth radiuses. These shock waves might be either constant, linked to the body, or unsteady, i.e., moving around with time. All of the shocks mentioned above can be damaging, so precautions must be taken to reduce their impact.

Question

A speaker produces 100 (w) of power. If the speaker projects sound uniformly
into the forward hemisphere, what is the intensity at 4m away from the speaker
a) 15.92 w/ m?
b) 3.98 w/ m?
c) 1.77 w/ m?
d) 1.00 w/ m?
O 1. c
O 2. a
O 3. b
O 4. d

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