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What average operating noise figure results when the amplifier is used with an antenna of temperature 30 K?

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in Electronic Devices & Circuits by (272k points)
What average operating noise figure results when the amplifier is used with an antenna of temperature 30 K?

(a) 9.54 db

(b) 10.96 db

(c) 11.23 db

(d) 12.96 db

I have been asked this question in an interview for internship.

My doubt is from Noise topic in chapter EDC Overview of Electronic Devices & Circuits

1 Answer

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Right option is (a) 9.54 db

The best I can explain: The required answer is 1 + 240/30 = 9 or 9.54 db.

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