2007-08-12 15:25:10 · 6 answers · asked by greek g 1 in Science & Mathematics ➔ Physics
Fairly short radio waves; VHF, UHF (microwave frequencies) and shorter wavelengths. That is, wavelengths from a few metres down to less than a centimetre. The shorter the wavelength, the more directional it is; you point it at the satellite and most of the signal energy goes in the direction of the satellite. Also, the shorter the wavelength, the more information it can carry, so a complicated signal like HDTV uses a short wavelength. But when Sputnik 1 was launched in 1957, it transmitted on 20.0005 MHz, which is in the short wave band. It was just broadcasting a beep beep beep for anybody, anywhere to pick up.
2007-08-12 18:52:25 · answer #1 · answered by zee_prime 6 · 0⤊ 0⤋
Waves Used For Telecommunication
2016-12-10 04:19:15 · answer #2 · answered by Anonymous · 0⤊ 0⤋
my answer is quite funny.... :) ... the artificial one obviously dont cost as expensive as the real one. So, some nations make these satellites( artificial ones) more visible to their enemy nations. Some nations destroy other satellites with bombs to scare them. These can be used like a sacrifice to save the real one....LOL
2016-03-12 23:00:20 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Electromagnetic (radio) waves, from about 1.5GHz to about 300GHz.
2007-08-12 20:24:25 · answer #4 · answered by Frank N 7 · 0⤊ 0⤋
electromagnetic waves... coz they can travel in a vacuum.
2007-08-12 15:44:30 · answer #5 · answered by quigonjan 3 · 1⤊ 0⤋
virtually all use radio waves.
2007-08-12 15:43:30 · answer #6 · answered by Anonymous · 0⤊ 0⤋