Multiple Choice
One of the "quiet" bands in the electromagnetic spectrum used for SETI is the so-called "water hole" between about 10³ and 10⁴ MHz.What is the principal source of the natural signals in this frequency band?
A) emissions from the water molecule
B) emissions from oxygen molecules
C) cosmic microwave background radiation
D) radio emission from terrestrial sources
Correct Answer:
Verified
Correct Answer:
Verified
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