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Ground waves are most effective when _________

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Ground waves are most effective when _________

(a) it is above about 20MHZ

(b) it is below about 3MHz

(c) it is at microwave frequencies

(d) usually in the UHF range

The question was asked in semester exam.

My query is from Frequency Translation topic in chapter Modulation of Analog Communications

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The correct answer is (b) it is below about 3MHz

The explanation: Ground wave is generally preferred for long distance communication using frequencies that are below 3MHz. It can be used for short distance communication by using frequencies between 3 and 30MHZ.

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