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Question:

For sky wave propagation, the radio waves must have a frequency range in between: 45 MHz to 50 MHz, 35 MHz to 40 MHz, 1 MHz to 2 MHz, 5 MHz to 25 MHz

1 MHz to 2 MHz

45 MHz to 50 MHz

35 MHz to 40 MHz

5 MHz to 25 MHz

Solution:

Answer is B
For Sky wave, frequency range of radio waves is between 5 MHz to 25 MHz.