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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
Helped a lot
brina10
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Yesterday
Good timing, thanks!
jayfo05
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2 hours ago
Correct Slight Smile TY
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