Name the waves used for echo depth sounding.(b) Give one reason for their use in the above application.

Echo of sound wave is due toSelect an answerArefractionBreflectionCdiffractionDNone of these

All echo-sounders can measure the _________.Select the correct response:average depth from waterline to hard bottomactual depth of wateraverage depth of water to soft bottomactual depth of water below keel

Give two practical applications of the reflection of sound waves.

Uttam and Nitesh are standing at 12 m and 20 m respectively from a cliff. They startshouting their names. They want to hear clear echo of their sound.(a) Will Nitesh and Uttam be able to hear a clear echo of their own sound?(b) Can you explain the condition for a sound to form an echo?

The following are properties of ultrasound waves as applied in medical imaging, except?1 pointThey are longitudinalThey are electromagneticThey are acousticThey depend upon the medium in which they propagate