Numerical - Antenna height for transmission of signal
The minimum antenna height required for transmission in reference to wavelength λ is
d.) 4 λ
Correct Answer : b.) λ/4
For effective transmission of signal by the transmitter, the antenna height should be at least quarter length of the signal wavelength i.e., λ/4
Required antenna height decreases with increase in frequency of the signal so modulation is done. With modulation, the low frequency signals are shifted to high frequency signals.