CFC is used in _________________?
Correct answer: D. All of above
- A. Refrigeration
- B. Aerosol spray
- C. Plastic foam industry
- D. All of above
Explanation
CFCs have been used as refrigerants, propellants in aerosol sprays and blowing agents in the manufacture of plastic foams. The likely mistake is selecting only refrigeration because that is the most familiar use, while all three listed applications are correct.
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About Electromagnetic Waves
Electromagnetic waves consist of mutually perpendicular, oscillating electric and magnetic fields that also remain perpendicular to the direction of propagation. They travel through vacuum at the speed of light and include radio waves, microwaves, infrared, visible, ultraviolet, X-rays and gamma rays. Unlike mechanical waves, they do not require a material medium.
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