[h=2]TRANSMITTER RANGE[/h] (10 points possible)
Imagine that we intend to communicate with a newly discovered civilization. They are at a distance of 87 light years from us.
If their radio receivers are similar to ours, they will be able to detect signals of about [FONT=MathJax_Main]8[FONT=MathJax_Main]×[FONT=MathJax_Main]10[FONT=MathJax_Main]−[FONT=MathJax_Main]33[/FONT][/FONT][/FONT][/FONT] watts per square meter. We will need to build a transmitter powerful enough that our signal will have this intensity when it arrives.
If we have built the transmitter correctly, we should be able to tell based on the intensity of the radio waves near the transmitter. What intensity should we expect the radio waves have at a distance of 1 meter from the transmitter?
Your answer should have units of watts per square meter.
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Imagine that we intend to communicate with a newly discovered civilization. They are at a distance of 87 light years from us.
If their radio receivers are similar to ours, they will be able to detect signals of about [FONT=MathJax_Main]8[FONT=MathJax_Main]×[FONT=MathJax_Main]10[FONT=MathJax_Main]−[FONT=MathJax_Main]33[/FONT][/FONT][/FONT][/FONT] watts per square meter. We will need to build a transmitter powerful enough that our signal will have this intensity when it arrives.
If we have built the transmitter correctly, we should be able to tell based on the intensity of the radio waves near the transmitter. What intensity should we expect the radio waves have at a distance of 1 meter from the transmitter?
Your answer should have units of watts per square meter.
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