The infra-red spectrum lies between:
Correct answer: B. The micro-wave and visible region
- A. Radio wave and micro-wave region
- B. The micro-wave and visible region
- C. The visible and ultra violet region
- D. The ultra violet and the X-ray region
Explanation
The infrared (IR) spectrum lies between visible light and the micro-waves on the electromagnetic spectrum. It has a longer wavelength and lower frequency than visible light but a shorter wavelength and higher frequency than micro-waves.
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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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