科研之友
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<正>在山谷中在山谷中,如果你对着远处的高山大喊一声,能听到山谷的回音能听到山谷的回音。这个声音是怎么产生的呢?An echo is a sound that is repeated because the sound waves are reflected back. Soundwave can bounce off smooth, hard objects in the same way as a rubber ball bounces off theground. Although the direction of the sound changes, the echo sounds the same as the original sound.Echoes can be heard in small spaces with hard walls, like wells, or where there are lots ofhard surfaces all around. That is why echoes can be heard in a canyon, cave, or mountain range.
