Your radar indicates a target; however,...

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Question 1 of 2066636ee928f7522a1c519f62

Your radar indicates a target; however, there is no visible object at the point indicated. A large mountain, approximately 50 miles away on the same bearing as the target, is breaking the horizon. You should suspect the radar target is caused by __________.

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Question 1 of 20

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🔍 Key Concepts

• radar propagation in the lower atmosphere (troposphere vs ionosphere) • the effect of temperature inversions and atmospheric layers on radar waves • whether the echo is from the surface/terrain or from another object at sea level

💭 Think About

• Think about which phenomena affect radar waves close to the Earth’s surface rather than very high in the atmosphere. • Ask yourself which option explains seeing an apparent contact at about the same bearing as a distant mountain that is just breaking the horizon. • Consider which answer choice is specifically associated with abnormal bending of radar beams so that they follow the Earth’s curvature more than usual.

✅ Before You Answer

• Verify which choices relate to surface/low‑level radar anomalies versus upper‑atmosphere effects. • Check which phenomenon can cause radar to pick up land/terrain targets beyond normal line‑of‑sight range. • Eliminate any options that would more likely produce no clear, fixed‑bearing land echo at that distance.

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