SONAR

The total time for sound waves to return to a ship was 8 seconds after being released. What is the depth in meters?

Distance (Depth) = Velocity x (Total time/2)

Velocity of sound in water = 1500 m/s

• 12,000m

• 6000m

• 375m

• 187.5m

If the depth of the ocean floor is 9000 meters, how long, in total time, does it take sound waves to return to the SONAR detector?

Distance (Depth) = Velocity x (Total time/2)

Velocity of sound in water = 1500 m/s

• 13,500,000sec

• 12sec

• 0.17sec

• 3sec

If the depth of the ocean floor is 7500 meters, how long does it take sound waves to reach the bottom of the ocean?

Distance (Depth) = Velocity x (Total time/2)

Velocity of sound in water = 1500 m/s

• 10sec

• 5sec

• 11,250,000sec

• 0.2sec

The speed of sound varies when the medium it passes through changes. For example, the speed of sound through air is 343 m/s. A boat mapping the seafloor near Greenland determines after a 12-second ping, the depth is 8100 meters. What is the speed of sound in this cold, icy water?

Distance (Depth) = Velocity x (Total time/2)

• 1875m/s

• 48,600m/s

• 675m/s

• 1350m/s

A boat release a SONAR ping from the surface. The graph below shows when the pulse was sent out and when the reflected pulse was received. How long did it take for the pulse to reach the seafloor and then return to the boat?

• .28 seconds

• .30 seconds

• .40 seconds

A carpet salesperson uses an ultrasonic device to measure the length of a room. The device shows that the distance from one wall to the opposite wall is 6.5 m. If the speed of ultrasound in air is 340 m/s, how long does it take for the ultrasound to travel to the far wall and back again?

• 0.019 s

• 0.038 s

• 4420 s