1.

Let F(ω) be the Fourier Transform of a function f(t). The F(0) is

A. \(\int\limits_{ - \infty }^\infty {f\left( t \right)} dt\)
B. \(\int\limits_{ - \infty }^\infty {{{\left| {f\left( t \right)} \right|}^2}dt}\)
C. \(\int\limits_{ - \infty }^\infty {{{\left| {t \cdot f\left( t \right)} \right|}^2}dt}\)
D. \(\int\limits_{ - \infty }^\infty {t \cdot f\left( t \right)dt}\)
Answer» B. \(\int\limits_{ - \infty }^\infty {{{\left| {f\left( t \right)} \right|}^2}dt}\)


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