FM radio stations use radio waves with frequencies from 88.0 to 108 MHz to broadcast their signals. Assuming that the inductance in Figure 24.4 has a value of 6.00 × 10-7 H, determine the range of capacitance values that are needed so the antenna can pick up all the radio waves broadcasted by FM stations.

Respuesta :

The range of capacitance values that are needed so the antenna can pick up all the radio waves broadcasted by FM stations is from 5.45 x 10⁻¹² H to 3.62 x 10⁻¹² H.

Resonance frequency

The frequency at which the antenna can pick the radio waves broadcasted is known as resonance frequency.

At resonance frequency, the capacitive reactance is equal to inductive reactance.

Xc = Xl

[tex]\frac{1}{2\pi fC} = 2\pi fL\\\\4\pi^2 f^2 LC = 1\\\\C = \frac{1}{4\pi^2 f^2L}[/tex]

where;

  • C is the capacitance
  • L is the inductance
  • f is the frequency

When the frequency is 88 MHz, the capacitance is;

[tex]C = \frac{1}{4\pi^2 \times (88 \times 10^6)^2 \times (6\times 10^{-7})} \\\\C = 5.45 \times 10^{-12} \ H\\\\[/tex]

When the frequency is108 MHz, the capacitance is;

[tex]C = \frac{1}{4\pi^2 \times (108 \times 10^6)^2 \times (6\times 10^{-7})} \\\\C = 3.62\times 10^{-12} \ H\\\\[/tex]

Thus, the range of capacitance values that are needed so the antenna can pick up all the radio waves broadcasted by FM stations is from 5.45 x 10⁻¹² H to 3.62 x 10⁻¹² H.

Learn more about resonance frequency here: https://brainly.com/question/9324332

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