(Solved): Why we care about the Fourier transforms of pulse trains in biochemistr ...

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Why we care about the Fourier transforms of $??$ pulse trains in biochemistry research (DNA + protein structures) Suppose you have 2 different periodic $??$ trains $x_1(t)$ and $x_2(t)$ : Physics / Chemistry: $0.2\sec$ between each spike $(\mathrm{f}=5\mathrm{Hz})$ Figure 4: You will now compare the Fourier transforms of signals with different periods 1) Sketch the Fourier transforms of both $x_1(t)$ and $x_2(t)$. Indicate the peak of each $??$ spikes, and label the spacings of the $??$ spikes. 2) Looking at your sketches, what do you think would happen to the Fourier transform of $x_2(t)$ if I keep increasing the frequency of the $?$-spikes of signal $x_2(t)$ ? Explain your thoughts in 1 or 2 sentences.