Read the information given below.
The basic principle of a microwave oven is to generate microwave radiation of appropriate frequency in the working space of the oven where we keep food. This way energy is not wasted in heating up the vessel. In the conventional heating method, the vessel on the burner gets heated first and then the food inside gets heated because of transfer of energy from the vessel. In the microwave oven, on the other hand, energy is directly delivered to water molecules which is shared by the entire food.
Microwaves are used in
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Radar system
Because of their short wavelengths, microwaves are suitable for the radar systems used in aircraft navigation; a narrow microwave beam is sent out and its reflection locates the aircraft.
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). Due to their short wavelengths, they are suitable for the radar systems used in aircraft navigation.”