Extra exam question E3A07
Subelement E3, RADIO WAVE PROPAGATION· Group E3A
Atmospheric ducts capable of propagating microwave signals often form over what geographic feature?
- A.Mountain ranges
- B.Stratocumulus clouds
- C.Large bodies of water (correct answer)
- D.Nimbus clouds
WhyAtmospheric ducts capable of propagating microwave signals often form over large bodies of water. Atmospheric ducts capable of carrying microwave signals well beyond line of sight commonly form over large bodies of water, where a stable temperature and humidity inversion layer sits just above the surface and traps radio waves inside it, answer C. Mountain ranges and cloud types like stratocumulus or nimbus aren't the geographic feature associated with this kind of tropospheric ducting.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
Related questions
- E3A01What is the approximate maximum separation measured along the surface of the Earth between two stations communicating by EME?
- E3A02What characterizes libration fading of an EME signal?
- E3A03When scheduling EME contacts, which of these conditions will generally result in the least path loss?
- E3A04In what direction does an electromagnetic wave travel?
- E3A05How are the component fields of an electromagnetic wave oriented?