Question

1pt how does sonar technology measure the depth of the ocean floor?

a. the device receives location information from satellites in orbit around earth.

b. the device lowers a cord from a ship to the bottom of the ocean and records the cords length.

c. the device receives electromagnetic energy that is emitted by cooling oceanic crust.

d. the device sends sound signals to the ocean floor and records the time it takes for each signal to

Explanation:

Sonar (Sound Navigation and Ranging) works by sending sound signals into the water. These sound waves travel down to the ocean - floor and bounce back as an echo. By measuring the time it takes for the sound to travel to the ocean - floor and back, the depth can be calculated using the speed of sound in water. Option A is about satellite - based location, Option B is a manual method not related to sonar, and Option C is about electromagnetic energy from oceanic crust which is not how sonar works.

Answer:

D. The device sends sound signals to the ocean floor and records the time it takes for each signal to return.