Radar Involves Using an Electromagnetic Wave to Detect an Object

question 2

Multiple Choice

Radar involves using an electromagnetic wave to detect an object by observing the reflected energy from that object.Assume an aircraft has a radar cross section of 710 m²,and the receiving antenna has a cross section twice as large.If the aircraft is 50 km away,what percentage of the radiated energy is eventually detected?

• A)1.0 × 10^-15
• B)20
• C)1.6 × 10^-13
• D)0.00040

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