The system under consideration is an RC low-pass filter (RC-LPF) with R = 1.0 k$\Omega$and C = 1.0$\mu$F.

Let H(f) denote the frequency response of the RC-LPF. Let f1 be the highest frequency such that 0$\le$|f| $\le$f₁, $\dfrac{ | H(f_1) | }{H(0)}$$\ge$ 0.95. Then f₁ (in Hz) is

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