[5 Points] What is the second harmonic frequency of the following signal? 5 === Σ k=0 x(t) 0 a. оъ. 3/2 О с. O d. 3п 9/2 3п/2 akejkat
[5 Points] Assume that ä(t) and y(t) are both continuous time aperiodic signals, and Fourier transform ä(t) is X(w). What is the Fourier transform of y(t) = x(2t) * x(t)? ○a. Y(w) = 2X(2w) + d²X(w) dw² ○ b. Y(w) = 1/2 X (²)X(w) O c. Y(w) = 2X(2w)X(w) O d. Y(w) = X(w) + 2X(w)ejwto
[5 Points] Assume that ä(t) and y(t) are both periodic signals with a period of T, and Fourier series coefficients for æ(t) is a. What is the Fourier series coefficients by for y(t) = 2x(3t) + ej2wtx(t)? O a. b = 2ak +ak-2 O b. bk 6ak O c. bk = (j2w₁ – 1)ak O d. bk = ak-2 + 6ak
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