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Klystron valve and Magnetron valve are used for the production of ___________

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Klystron valve and Magnetron valve are used for the production of ___________

(a) Radio Waves

(b) Micro Waves

(c) Infra-red

(d) Ultraviolet

The question was posed to me in unit test.

I want to ask this question from Mechanism of Light Emission in section Optics of Engineering Physics II

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Right choice is (b) Micro Waves

For explanation I would say: Microwaves are also called short-wavelength radio waves. They are produced by special vacuum tubes called klystron valve, magnetron valves, and Gunn diodes. They are used in the radar system as they have a short wavelength.

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