At a distance of 10 km, a 100 Hz horn assumed to be an isotropic point source

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At a distance of 10 km, a 100 Hz horn assumed to be an isotropic point source is barely audible. At what distance would it begin to cause pain.

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Fundamentals of Physics

ISBN: 978-0471758013

8th Extended edition

Authors: Jearl Walker, Halliday Resnick

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