Question

A SONAR echo takes 3 sec to return from a whale.How far away is the whale from SONAR?Speed of sound in sea water is 1440m/s

Answer 1

Time of Sonar echo to return from the whale = 3 sec

Speed of sound in water= 1440m/s

Distance of whale from Sonar= speed x time /2 = 1440 x 3 / 2 = 2160meter

Echo happens when sound travels double distance. It hits the whale and returns. So, the distance is devided by 2.