Which of the following did French mathematician Jean Baptiste Joseph Fourier develop?

A. A means to break down any periodic waveform into a series of sine and/or cosine waves at multiples of the fundamental frequency.
B. He created thermal interactions between free electrons and vibrating ions in a conductor.
C. The formula for calculating shot noise contributed for a complete transistor.
D. The relative measure of the desired signal power to the noise power.


A

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