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Question

(B) The minimum size of a transmitting antenna is given by $l = \frac{\lambda}{4}$.Given frequency $f = 1500 	ext{ MHz} = 1500 	imes 10^6 	ext{ Hz}

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$5 	ext{ cm}$

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(B) The minimum size of a transmitting antenna is given by $l = \frac{\lambda}{4}$.Given frequency $f = 1500 	ext{ MHz} = 1500 	imes 10^6 	ext{ Hz}$.The speed of light $c = 3 	imes 10^8 	ext{ m/s}$.The wavelength $\lambda = \frac{c}{f} = \frac{3 	imes 10^8}{1500 	imes 10^6} = \frac{3}{15} = 0.2 	ext{ m}$.Therefore,the minimum length $l = \frac{0.2}{4} = 0.05 	ext{ m}$.Converting to centimeters,$l = 0.05 	imes 100 = 5 	ext{ cm}$.

The minimum size of an antenna for transmitting electromagnetic waves at $1500 \text{ MHz}$ is

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