ISRO Scientist or Engineer Electronics Dec 2017 Question 73

Question 73

The solid angle subtended by the sun as viewed from the earth is Ω =$$4 \times 10^{-5}$$ steradian.
A microwave antenna designed to be used for studying the microwave radiation from the
sun has a very narrow beam whose equivalent solid angle is approximately equal to that
subtended by the sun. What is the approximate directivity, D?

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