What is an echo? Name the two devices which work on the principle of echo of ultrasonic waves.

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Solution

The sound heard after reflection from a rigid surface is called echo.
Two devices which works on the principle of ultrasonic waves are:
i) Sonar
ii) Ultrasound scanner

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What is an echo? Name the two devices which work on the principle of echo of ultrasonic waves.

The sound heard after reflection from a rigid surface is called echo.Two devices which works on the principle of ultrasonic waves are:i) Sonarii) Ultrasound scanner

The sound heard after reflection from a rigid surface is called echo.
Two devices which works on the principle of ultrasonic waves are:
i) Sonar
ii) Ultrasound scanner