Question

We do not transmit low frequency signal to long distance because-
(a) The size of the antenna should be comparable to signal wavelength which is unreal solution for a signal of longer wavelength
(b) Effective power radiated by a long wavelength baseband signal would be high
(c) We want to avoid mixing up signals transmitted by different transmitter simultaneously
(d) Low frequency signal can be sent to long distances by superimposing with a high frequency wave as well
Therefore, the most suitable option will be

• A. All statements are true
• B. (a), (b) and (c) are true only
• C. (a), (c) and (d) are true only
• D. (b), (c) and (d) are true only

Answer 1

The Correct Option is C

For longer wavelength, size of antenna would increase.

Also, mixing of signals needs to be avoided. 

Also, we can use modulation to send low frequency signal by superimposing them with high frequency signals.

The correct option is (C): (a), (c) and (d) are true only