What is Rayleigh's theorem?

Q.  According to Rayleigh's theorem, it becomes possible to determine the energy of a signal by________
- Published on 30 Nov 15

a. Estimating the area under the square root of its amplitude spectrum
b. Estimating the area under the square of its amplitude spectrum
c. Estimating the area under the one-fourth power of its amplitude spectrum
d. Estimating the area exactly half as that of its amplitude spectrum

ANSWER: Estimating the area under the square of its amplitude spectrum

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