Answer: option (D.)They send signals in the gigahertz range to relays in the line of sight.
Explanation:
Microwaves are a form of electromagnetic waves with wavelengths between from about a meter to a millimeter; and they possess frequencies between 300 mega hertz(MHz )and 300 giga hertz(GHz.)
Microwaves travel by line-of-sight; unlike other radio waves of lower frequency. They do not bend around hills, nor follow the earth's surface as ground waves, nor reflect from the ionosphere .Therefore land microwave communication links are restricted only tovisual horizon to about 40 miles (64 km).
Answer:
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Explanation:
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It takes 29.5 days for a new moon to occur approximately after a full moon.
Answer:
The rate of change of position in which the same distance is traveled each second is called uniform velocity.
Explanation:
- When there is a change in the position coordinate of an object with respect to time, it is has a velocity associated with it.
- Similarly, when there is a change in the velocity component of the object with respect to the time, there is an acceleration associated with it.
- When the rate of change of position in which the same distance is traveled each second, the object is said to be in uniform velocity. Therefore, there is no acceleration acting on the object.
- Since there is no acceleration acting on the object, the net force on the object is zero.