The following items will test your grasp of the material covered in this lesson. There is only one correct
answer for each item. When you complete the exercise, check your answers with the answer key that
follows. If you answer any item incorrectly, study again that part of the lesson which contains the
Rocky terrain provides better conductivity for radio wave propagation than what other type of
Flat, loamy soil
A large body of fresh water
Which region of the Earth's atmosphere is used for long-distance communications?
A radio receiver picks up a signal propagated over a ground wave. The signal strength depends
conductivity along the path. What else does the signal strength depend on?
The type of power being used
The operator's skills
The age of the receiving radio
The power output
A surface wave follows the curvature of the Earth due to which process?