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Question:

Long range radio transmission is possible when the radio waves are reflected from the ionosphere. For this to happen, the frequency of the radio waves must be in the range 8-85 MHz, 1-17 MHz, 80 MHz, 150 kHz.

80 MHz

1 MHz

150 kHz

8 MHz

Solution:

The radiowaves having frequency between 3 MHz to 30 MHz are reflected from ionosphere.