The waves related to tele-communication are:
Correct answer: C. Microwaves
- A. Infrared radiations
- B. Visible light
- C. Microwaves
- D. Ultraviolet rays
Explanation
Microwaves are radiations whose wavelengths pass through the Earth's atmosphere and can be used to transmit information to and from satellites in orbit. Satellite television signals use microwaves.
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About Alternating Current
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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