(I) A hiker determines the length of a lake by listening forthe echo of her shout reflected by a cliff at the far end of thelake. She hears the echo 2.5 s after shouting. Estimate thelength of the lake.

(I) A hiker determines the length of a lake by listening forthe echo of her shout reflected by a cliff at the far end of thelake. She hears the echo 2.5 s after shouting. Estimate thelength of the lake.

University Physics Volume 1

18th Edition

ISBN:9781938168277

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

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

Chapter16: Waves

Section: Chapter Questions

Problem 13CQ: If the tension in a string were increased by a factor of four, by what factor would the wave speed...

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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

(I) A hiker determines the length of a lake by listening for
the echo of her shout reflected by a cliff at the far end of the
lake. She hears the echo 2.5 s after shouting. Estimate the
length of the lake.

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