The time period of the communications satellites must be 24 hours to make one complete orbit around the earth.
An object that has been placed into orbit in space on purpose is known as a satellite or artificial satellite. Most spacecraft, with the exception of passive satellites, contain a means of generating electricity for the electronics they carry, such as solar cells or radioisotope thermoelectric generators.
A communications satellite is a man-made spacecraft that uses a transponder to relay and amplify radio telecommunication signals. It establishes a channel of communication between a source transmitter and a receiver situated at various points on Earth.
Most satellites that orbit the Earth do so between 160 and 2,000 kilometers above the surface. Because of how closely the satellites are orbiting the Earth, this orbital regime is known as low Earth orbit or LEO. The normal orbital period for satellites in low Earth orbit (LEO) is between 90 and 2 hours.
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The Doppler effect determined and supported that the universe was expanding by measuring the Doppler effect in the light emitted from galaxies.
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A beta particle is identical to : an electron
Both of beta particle and electron are high in energy and move in high speed.
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