Physics
(i) Name the waves used for echo depth sounding.
(ii) Give one reason for their use for the above purpose.
(iii) Why are the waves mentioned by you not audible to us?
Sound
ICSE 2016
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Answer
(i) The waves used for echo depth sounding are ultrasonic waves.
(ii) They can travel undeviated through long distances.
(iii) Ultrasonic waves are not audible to us because they are of frequency above 20 kHz and the audible frequency range is 20 Hz to 20,000 Hz. Hence, we cannot hear ultrasonic waves.
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