If λv, λx and λm represent the wavelengths of visible light, X-rays and microwaves respectively, then:
Correct answer: B. λm > λv > λx
- A. λm > λx > λv
- B. λm > λv > λx
- C. λv > λx > λm
- D. λv > λm > λx
Explanation
The electromagnetic spectrum is generally divided into seven regions, in order of decreasing wavelength and increasing energy and frequency. The decreasing order of the wavelengths of electromagnetic waves would be; radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV) light, X-rays, and gamma-rays. Hence the correct answer would be λm>λv>λx
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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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