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How does echo happens?

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by

royce lee

on 27 November 2014

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Transcript of How does echo happens?

How does echo happens?
Introduction
Echo is a sound or sounds caused by the reflection of sound waves from a surface back to the listener. I decided to do project about this because i was curious about how echo happenes and what is used for. Also I was curious about what condition we need to have to make echo happen and echo's history.
Where the word Echo comes from?
How does echo works?
An echo occurs when a sound wave reflects back towards its source after hitting a hard surface. Although the surface may absorb some of the sound, the remaining sound that is not absorbed continues moving, creating additional echoes by bouncing off surrounding objects until the sound is completely absorbed or dissipates.
Conclusion
I have learnt many things such as what echo is and how echo got named. Also, echo can used in many ways such as finding out how deep ocean is using echo.it sends a signal and it hit the floor and hit the receiver back and calculate how deep it is by using time and speed
the word echo, as we use it, comes from Greek mythology. Echo was a nymph whose job it was to talk to Hera constantly while Zeus was having affairs, thus distracting hera.when Hera found out, she cursed Echo only be able to repeat what someone else had said, thus, the word echo.
Thank you
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