Question

A submarine sends sonar signals to the ocean floor. Over time, the signals take longer to reflect off of the ocean floor and back to the submarine. Which of the following could explain why this is?
A- The signals could be reflecting off of objects above the ocean floor
b- The sound waves could be slowing as they move through the water
c- The submarine could be rising toward the surface
d- the submarine could be moving toward the ocean floor

Answer 1

Answer:

A- The signals could be reflecting off of objects above the ocean floor is the answer.

Explanation:

According to National Ocean Service, a sonar is a helpful tool for exploring and mapping the ocean. They are used to develop nautical charts, locate underwater hazards to navigation, search for and map objects on the seafloor such as shipwrecks, and map the seafloor itself. There are two types: active (emit an acoustic signal) and passive (which receive that signal.)

Answer 2

C- the submarine could be rising towards the surface