Which of the following EM waves can be produced by using Klystron or Magnetrons or Gunn diodes?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Microwaves
Each part of the electromagnetic spectrum is produced by its own kind of source. Microwaves (short-wavelength radio waves) are produced by special vacuum tubes called klystrons, magnetrons and Gunn diodes; they are used in radar and microwave ovens.
NCERT (2026-27):
Microwaves – “Microwaves (short-wavelength radio waves), with frequencies in the gigahertz (GHz) range, are produced by special vacuum tubes (called klystrons, magnetrons and Gunn diodes).”