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Darpan Darpan
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6 years ago
Ever since radio broadcasting began, one of the major complications in making AM radio channel assignments has been the fact that AM signals travel long distancesbut only at night, not in the daytime. This phenomenon is caused by:
 
  a) satellites; b) large mirrors erected by scientists to study the upper atmosphere; c) skywave propagation; d) solar flares; e) aurora borealis.
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dalj;adalj;a
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6 years ago
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Darpan Author
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6 years ago
Good timing, thanks!
Fleury
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Yesterday
I appreciate what you did here, answered it right Smiling Face with Open Mouth
Morgan-C
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2 hours ago
Helped a lot
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