Q. An antenna uses electromagnetic waves of frequency 5 MHz. For proper working, the size of the antenna should be

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Solution:

$C=f \lambda$ $\lambda=\frac{C}{f}=\frac{3\times10^{8}}{5\times10^{6}}=10^{2}=60m$ The antenna length should be $\frac{\lambda}{4}=\frac{60}{4}=15 m$

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