Question

The waves used in telecommunication are
A. Infrared
B. Ultraviolet
C. Microwaves
D. Cosmic rays

Answer 1

Hint- There are many types of waves which come under the electromagnet and all of them are used in some or other application. Firstly let us define the electromagnetic wave and then the telecommunication transmission and finally the waves used in telecommunication.

Step-By-Step answer:
Electromagnetic waves are waves that, as in space, can propagate in a vacuum. This is because they are not in real material vibrations; they are electrical and magnetic field variations. Example radio waves, micro-waves, infrared, light-visible, ultraviolet, x-ray and gamma rays include electromagnetic waves. The lowest energy, frequency and wavelength are radio waves. The maximum intensity and frequency with the lowest wavelength are gamma rays.
Examples of telecommunications products include television, radio, fiber optics, satellites and the internet.
Microwaves are electromagnetic radiation that finds applications in communications, radar, and cooking. The frequencies of microwaves range from 1 GHz to 300 GHz.

Thus in telecommunication, microwaves are used.
Hence the correct option is “C”.

Additional Information-
Telecommunication involves the transmitting, over cable, antenna, visual or other electromagnetic devices, of information through various forms of technologies. This originates from the ability of humanity to communicate with the human voice more at a distance than possible, but with a comparable sense of expediency.

Note- Every source of electromagnetic radiation like visible light periodically oscillates, exhibiting a normal amplitude, wavelength and frequency that determines the path, energy and intensity of the radiation. Telecommunication is the process of exchange of information by using electronic devices.