UV radiation can be produced by______________?
Correct answer: B. Electron excitation in the gas
- A. Heating the filament
- B. Electron excitation in the gas
- C. Ionization of atoms
- D. All the above
Explanation
Ultraviolet radiation can be produced when electrons in a gas are excited to higher energy levels and then fall to lower levels, emitting photons in the ultraviolet range. The likely mistake is choosing ionization of atoms, because ionization removes electrons but does not itself specify the emission of ultraviolet photons.
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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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