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Question

A radio station has two channels. One is AM at 1020 kHz and the other FM at 89.5 MHz. For good results you will use
  1. same length antenna will work for both.
  2. longer antenna for the AM channel and shorter for the FM.
  3. shorter antenna for the AM channel and longer for the FM.
  4. information given is not enough to say which one to use.


Solution

The correct option is C shorter antenna for the AM channel and longer for the FM.
For AM channel of 1020 kHz, ground wave propagation is used for which antenna need not be very tall.
For high frequency FM of 89.5 MHz, space wave communication is used for which very tall antennas are needed. 
 

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