Which of the following electromagnetic waves has minimum frequency?
Correct answer: A. Radio wave
- A. Radio wave
- B. Ultrasonic wave
- C. Microwave
- D. Audible wave
Explanation
Radio waves have a least frequency that is about 10 Hz.
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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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