Discussion
Which of these is an external noise source?
Answer: D
Atmospheric static, along with galactic and man-made noise, arrives at the antenna from outside the receiver, whereas the other three are generated within it. The distinction matters because external noise can sometimes be reduced by siting, shielding or directional antennas, while internal noise can only be reduced by better devices. At medium wave the external contribution usually dominates, which is why a very low noise front end buys little there.
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