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What is the spectrum that is obtained when we plot |ck |^2 as a function of frequencies kF0, k=0,±1,±2..?

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What is the spectrum that is obtained when we plot |ck |^2 as a function of frequencies kF0, k=0,±1,±2..?

(a) Average power spectrum

(b) Energy spectrum

(c) Power density spectrum

(d) None of the mentioned

I had been asked this question in quiz.

I want to ask this question from Frequency Analysis of Continuous Time Signal topic in section Frequency Analysis of Signals and Systems of Digital Signal Processing

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The correct choice is (c) Power density spectrum

The best explanation: When we plot a graph of |ck|^2 as a function of frequencies kF0, k=0,±1,±2… the following spectrum is obtained which is known as Power density spectrum.

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