State one important property of waves used for echo depth sounding.

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Solution

1. Echo is nothing but the reflection of sound. For the condition of echo, the required distance between the source of sound and the object with which sound is reflected is $17 m$ .
2. The waves used for echo depth sounding are ultrasonic waves.
3. Ultrasonic waves travel undeviated through long-distance and can be confined to a narrow beam.

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