Q. Why can only some places create an echo?
avery

Why can only some places create an echo?

How are these places different?
How can we hear our own voice again and again in a row?


voice reflection echo
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Aug, 2018

Science and Technology
 1.05 q
1 Answer
  • vaibhavi

    An echo is caused by the reflection of sound waves at some moderately even surface, such as the wall of a building.
    The waves of sound on meeting the surface are turned back in their course, according to the same laws that hold for reflection of light.
    In order that the echo may return to the place from which the sound proceeds, the reflection must be direct, and not at an angle to the line of transmission, otherwise the echo may be heard by others, but not by the transmitter of the sound.
    This may be effected either by a reflecting surface at right angles to the line of transmission or by several reflecting surfaces, which end in bringing the sound back to the point of issue.


       

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Science and Technology

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