Which of the following is not E.M wave?
Correct answer: D. Sound waves
- A. Radio waves
- B. X-rays
- C. Light waves
- D. Sound waves
Explanation
Factual. Electromagnetic waves include:Gamma rays, X rays, Ultra violet, Visible light, Infra-Red, Microwaves, RADIO WAVES.So, D is not a EM wave.
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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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