3 4. You are given a single "pulse" (height =10 and width W ) as defined below. x(t)=10for0.5Wt0.5Wx(t)=0forallothert a. Sketch this pulse. b. Is this a periodic signal? Do you need Fourier series expansion or Fourier transform for this signal? c. Using applicable technique you decided in problem 4-b above and suitable formula from "Table of Fourier Transform Pairs" or textbook, determine the spectrum of this signal in f or . Simplify the results