Question

The bandwidth required for transmitting video signal is
A) 50 kHz
B) 1 MHz
C) 4.2 MHz
D) 6 MHz

Answer 1

Hint : The bandwidth for transmitting any kind of signal depends on the amount of data that has to be transmitted. For transmitting video signals, we need to transmit a lot of videos that require high bandwidths.

Complete step by step answer
Bandwidth is also defined as the amount of data that can be transmitted in a fixed amount of time. Different types of transmission mediums are capable of different bandwidths. The commonly used transmission mediums are wires, the layer of the ionosphere in the atmosphere, and fiber optic cables.
The bandwidth for transmitting video signals is 4.2 MHz which corresponds to option (C).

Additional Information
A TV signal contains both audio and video and is usually allocated 6 MHz of bandwidth for transmission for TV signals. Hence more bandwidth is required since we want to transmit video and audio signals together and hence we need to transfer more data which requires more bandwidth. Communication through the atmosphere using radio waves offers a wide range from hundreds of kHz to a few GHz so video signals are transmitted using this medium. This is the reason why many TV service providers use satellite dishes to receive these signals that are bounced from the atmosphere.

Note
We must be aware of the bandwidth required by different kinds of signals. The speech signals require bandwidth = 2800 Hz. Any music requires a bandwidth of 20kHz because of the range of audible frequencies produced by musical instruments. Since video signals are heavier in data than audio signals so they require more bandwidth hence we can eliminate option (A) since we will require much more bandwidth than the bandwidth required by audio signals.