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# What is the length of half wave dipole antenna at 100MHz

$\begin{array}{1 1}(a)\;1m\\(b)\;1.5m\\(c)\;0.75m\\(d)\;2m\end{array}$

Frequency $\nu=100MHz=100\times 10^6$Hz
Speed of light $c=3\times 10^8$m/s
Wave length=$\lambda=\large\frac{c}{\nu}=\frac{3\times 10^8}{100\times 10^6}$$=3m Length of half wave antenna=\large\frac{\lambda}{2}=\frac{3}{2}$$=1.5m$
Hence (b) is the correct option.