UNIVERSE
SATELLITESICY BODIES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
What must radio waves move around? Select the best answer
|
|
The curvature of Earth
|
|
|
The population of people
|
|
|
The population of animals
|
|
|
Trees and other plants
|
Explanation:
Detailed explanation-1: -Earth’s curvature is a direct block to line-of-sight communication. When enough distance separates the two radio stations so that their antennas fall behind the curvature, the Earth itself blocks the transmitted signals from the receiver.
Detailed explanation-2: -Electromagnetic waves entering Earth’s atmosphere from space are bent by refraction. Atmospheric refraction is greatest for signals near the horizon where they come in at the lowest angle. The apparent altitude of the signal source can be on the order of half a degree higher than its true height.
There is 1 question to complete.