The light rays used for eliminating bacteria?
Correct answer: D. ultra-violet radiation
- A. X-rays
- B. infrared rays
- C. microwave radiation
- D. ultra-violet radiation
Explanation
Ultraviolet radiation damages the DNA of microorganisms and is therefore used to disinfect water, air and surfaces. X-rays can also kill cells at high doses, but UV is the standard radiation used for routine germicidal treatment.
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About Physics in Daily Life
Everyday physics explains motion, force, work, power, pressure, heat, light, sound and electricity through familiar devices and natural events. Topics include simple machines, friction, expansion, reflection and refraction, lenses, household circuits, electrical safety and magnetism, with mass distinguished from weight and heat distinguished from temperature.
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