The waves which can travel directly along surface of the earth are known as:
Correct answer: A. Ground waves
- A. Ground waves
- B. X-ray
- C. α − rays
- D. Sky waves
Explanation
The waves which can travel directly along surface of the earth are known as ground waves. The ground wave is the preferred propagation type for long distance communication using frequencies below 3 MHz (the earth behaves as a conductor for all frequencies below 5 MHz). The ground wave is also used for short distance communications using frequencies between 3 and 30 MHz.
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Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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