a) The low frequency signals need to be translated into high frequency waves before transmission. Three reasons for this are
i. For efficient transmission and receiving the signals, antennas must have lengths equal to quarter wavelength of the signal. Setting up vertical antennas of such big size is practically impossible.
ii. The energy radiated from an antenna is practically zero. The power radiated at audio frequency is quite small; hence, transmission occurs in loss.
iii. The various information signals transmitted at low frequency get mixed with noise and hence cannot be distinguished.
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