A SETI search using the 300-meter diameter Arecibo radio telescope can detect a 10 million Watt transmission at a distance of 1,000 light-years. If we were to detect a similar signal coming from 10,000 light-years away, how powerful would the alien transmitter have to be?
A) 1 billion Watts
B) 10 million Watts
C) 10 billion Watts
D) 100 million Watts

Question

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The Answer of A SETI search using the 300-meter diameter Arecibo radio telescope can detect a 10 million Watt transmission at a distance of 1,000 light-years. If we were to detect a similar signal coming from 10,000 light-years away, how powerful would the alien transmitter have to be?
A) 1 billion Watts
B) 10 million Watts
C) 10 billion Watts
D) 100 million Watts

A SETI Search Using the 300-Meter Diameter Arecibo Radio Telescope