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Wave Equation of EM Waves

If the freque...

Question

If the frequency of audio signal is 20 KHz, then the height of antenna is about (in km)

A

3.75

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B

37.5

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C

375

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D

3750

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Solution

The correct option is A 3.75
We use quarter wavelength antennas for efficient transmission.
Thus we get $\frac{λ}{4} = \frac{c}{4 ν} = \frac{3 \times 10^{8}}{4 \times 20 \times 10^{3}} = 3.75 k m$

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