Multiple choice

The 3-dB bandwidth of the low-pass signal e-t u(t), where u(t) is the unit step function, is given by

  1. $\dfrac{1}{2\pi} HZ$
  2. $\dfrac{1}{2\pi} \sqrt{ \sqrt{2} - 1HZ }$
  3. $\infty$
  4. 1 HZ

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Explanation