2007-09-18 03:41:29 · 4 answers · asked by JAMES 4 in Science & Mathematics ➔ Engineering
Like Jared_e42 says... energy from the very first wireless transmissions by Marconi is now over 100 light years away from earth. It may be so weak as to be undetectable, but it is still there and still travelling away from earth at a rate of 1 light year per year.
For all practical purposes, Voyager 1 is now over 100 Astronomical units away from earth, and we can still transmit and receive useful signals from it. That's 100 * 93 million miles, or over 9.3 billion miles away.
That's the 'record' so far for transmitting and receiving.
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2007-09-18 03:59:48 · answer #1 · answered by tlbs101 7 · 3⤊ 0⤋
Wireless, as in radio, around the world until the signal is absorbed is an every day occurrence. If you are talking about cell phones, under the right conditions, 30 miles would be possible. Cell phones are what are known as line of sight transmission devices. How far you can see is about how far they can transmit. That said, what the phones transmitter can see might be different that what you can physically see since the relay tower might be with in the "sight" range of the cell phone, but you can not physically see it.
2007-09-18 13:09:37 · answer #2 · answered by Anonymous · 0⤊ 0⤋
I think the furtherest distance is the the voice traveling distance that a normal human can hear. As the sound particles vibrate along the air molecules, i think the strength of your voice will get weaker as a result, you will also need to determine the receiver of the signal since human beings are unique with their sound receiving capabilities.
2007-09-18 10:49:25 · answer #3 · answered by Ksee 2 · 0⤊ 1⤋
Well, radio and TV rays from the 1920s and 1930s are reaching our neighboring solar systems.
SETI is searching for radio waves from intelligent life elsewhere.
2007-09-18 10:48:12 · answer #4 · answered by jared_e42 5 · 1⤊ 0⤋