Discussion
Indicate the noise whose source is in a category different from that of the other three.
Answer: C
Atmospheric noise comes from the earth's own atmosphere, lightning discharges in particular, while solar, cosmic and galactic noise all come from beyond the earth and are classed as extraterrestrial noise. The passage names the extra-terrestrial group as solar and cosmic noise, and galactic noise is the same cosmic type. So the one whose source is in a different category from the other three is atmospheric noise, option C.
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