Echo Time Calculation in Underwater Environments

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SUMMARY

The discussion centers on calculating the time it takes for an echo to return to a seal after it emits a sound in underwater environments. Given the distance of 53.0 meters and the speed of sound in seawater at 1533 m/s, the correct calculation involves determining the total distance the sound travels (to the object and back) and using the formula time = distance/speed. The correct answer is approximately 0.069 seconds, not the incorrect speed derived from the Doppler effect formula.

PREREQUISITES
  • Understanding of basic physics concepts, specifically sound propagation in water.
  • Familiarity with the formula for calculating time based on distance and speed.
  • Knowledge of the Doppler effect and its application in sound wave scenarios.
  • Ability to distinguish between speed and time in physics problems.
NEXT STEPS
  • Review the principles of sound propagation in different mediums, focusing on seawater.
  • Learn how to correctly apply the time = distance/speed formula in echo calculations.
  • Study the Doppler effect and its relevance to sound waves, ensuring clarity on its application.
  • Explore additional examples of echo calculations in various environments, including underwater acoustics.
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone interested in acoustics, particularly in underwater environments. It provides insights into sound behavior and calculations relevant to marine biology and oceanography.

rrosa522
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Homework Statement


A seal sees a shark 53.0 m away and let's out a
squeal. If the speed of sound through sea water
is 1533 m/s, how long will it take for the echo
of the squeal to return to the seal?

Homework Equations

The Attempt at a Solution


i used the doppler effect formula and got 0.99m/s but it isn't the right answer
 
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rrosa522 said:
i used the doppler effect formula and got 0.99m/s but it isn't the right answer
Doppler effect? What, apart from sound waves, is moving?
The question asks for a time, not a speed.
What is the sound echoing off?

I note the title mentions a submarine. Have you posted the text for the wrong question?
 

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