Question

in a submarine fitted with a sonar ,the time interval between the generation of an ultrasonic wave and the time receipt of its eco is 200s. what is the distnace of the enemy submarine? the speed of sound in water is 1.450 kms-1

Answer 1

Hi dear 
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Suppose that the distance from enemy sub - marine = x 

Then , The Total distance covered by wave  in water = 2x 

We know , Velocity = Distance / Time 
                             
ATQ , 
Velocity of sound wave  × time = total distance covered by sound wave in water 

1450 × 200  = 2x 

x = 1450 × 200 / 2 

   = 1450 × 100 
  
   = 145000 m = 145 km 
   

Answer 2

the distance from enemy sub - marine = x 

Then , The Total distance covered by wave  in water = 2x 

We know , Velocity = Distance / Time 

                             

ATQ , 

Velocity of sound wave  × time = total distance covered by sound wave in water 

1450 × 200  = 2x 

x = 1450 × 200 / 2 

   = 1450 × 100 

  

   = 145000 m = 145 km