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How long does it take for a radio wave to go from the earth up to such a satellite and back down to earth?
Wiki User
∙ 15y ago
That depends how high the atmospheric reflecting layers are, how many times the signal
has to bounce between those ionized layers and the ground, and how long the actual path
is by the time it goes through enough up and down zigs and zags.
Just for grins, let's assume the total distance it has to travel in order to go half-way around
the world in an up and down zig-zag is actually equal to the distance all the way around
the world.
It takes a radio wave about 0.134 of a second to cover that distance.
Wiki User
∙ 14y ago
Wiki User
∙ 13y agoThat all depends on how high the satellite's orbit is from the earth.
The International Space Station's orbit is about 220 miles above the surface.
A radio round-trip from the point directly under the ISS takes about 0.0024 sec.
TV and communications satellites are in orbits 22,400 miles above the equator.
The round-trip radio or TV time from a point directly under one of those is about
0.24 second ... quite noticeable on a telephone call through a satellite.
The moon's orbit averages about 238,000 miles from earth. The round-trip delay for
radio to and from the moon ... as we saw memorably during the Apollo missions ...
is 2.56 seconds.
Wiki User
∙ 15y agoFor a typical communication satellite it takes about 1/8 of a second for a radio wave to reach the satellite, and of course 1/8 second to return to earth.
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What do radio waves bounce off?
Radio waves are reflected by many solid objects, such as wood, stone, and notably metal, allowing the use of microwaves in radar applications.Also importantly in broadcast radio, the ionosphere (an upper layer of the Earth's atmosphere) can bounce signals back down to locations beyond the line-of-sight horizon.
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