State two practical uses or applications of echoes.
(N/A) Echoes are used in the following ways:
$1$. $SONAR$ ($Sound$ $Navigation$ $And$ $Ranging$) systems use echoes to determine the depth of the sea and to locate underwater objects like submarines,shipwrecks,or icebergs.
$2$. Medical ultrasound imaging uses echoes of high-frequency sound waves to create images of internal organs,such as monitoring the development of a fetus during pregnancy.
$1$. $SONAR$ ($Sound$ $Navigation$ $And$ $Ranging$) systems use echoes to determine the depth of the sea and to locate underwater objects like submarines,shipwrecks,or icebergs.
$2$. Medical ultrasound imaging uses echoes of high-frequency sound waves to create images of internal organs,such as monitoring the development of a fetus during pregnancy.
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