1.

Which statement is true ? * 1:-SONAR technique can be used to locate a submarine2:-The speed of sound in water is less than that of air3:-Infrasound has frequency greater than 20000 Hz4:-Ultrasound has frequency less than 20 Hz​

Answer»

first OPTION is the CORRECT optionexplanation:because SONAR technique can be USED to locate a SUBMARINE



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