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What should be the value of R2 to have an attenuation of 0.5, if R1=200Ω?

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What should be the value of R2 to have an attenuation of 0.5, if R1=200Ω?

(a) 100Ω

(b) 300Ω

(c) 200Ω

(d) 500Ω

I have been asked this question by my college director while I was bunking the class.

I'd like to ask this question from Gain, Attenuation & Decibels topic in section Fundamentals of Electronics of Avionics

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The correct choice is (c) 200Ω

Explanation: Attenuation =R2/(R2+R1) = 0.5

R2 = (0.5 X R2) + (0.5 X R1)

(0.5 X R2) = 100Ω

R2= 100/0.5 = 200Ω.

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