Question

For an efficient transmission of $100MHz$ frequency, the minimum required length of antenna should be _____

• A. $3m$
• B. $10m$
• C. $\frac{3}{4}m$
• D. $100m$

Answer 1

The correct option is C $\frac{3}{4}m$

The minimum height of the antenna$\left(l\right)$ needs to be $\frac{1}{4}$ of the wavelength.

$\lambda =\frac{c}{f}=\frac{3\times {10}^8}{100\times {10}^6}=3m$

$\therefore l=\frac{3}{4}m$