2.what do you mean by persistance of hearing
3.what is minimum distance between observer and obstruction to hear a clear echo
4.what is formula of echo
5.what is difference between echo and reverberation
6.what is full form of SONAR
7.how does a sonar work
8.explaim breifly working of sonar
9.what is transponder in sonar means
10.what is speed of sound in liquids and gases aplroximetly
11.
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