The electromagnetic waves used in radio, television and mobile phone communication are
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → radio waves
Option (1) infrared waves — Incorrect. Infrared waves are heat waves given out by hot bodies and molecules. Infrared LEDs work the remote switches of TV sets, but the radio, TV and mobile phone signals themselves are not carried by infrared.
Option (2) visible light — Incorrect. Visible light is the part of the spectrum that the human eye detects. It brings us information about the objects around us. It is not used for radio, TV or mobile phone links.
Option (3) radio waves — Correct. Radio waves carry radio and television broadcasts (the AM, FM and TV bands), and cellular phones also use them, in the UHF band.
Option (4) ultraviolet rays — Incorrect. Ultraviolet radiation comes from special lamps and very hot bodies such as the sun. The ozone layer absorbs most of it, and large amounts harm humans. It is not used for communication.
NCERT (2026-27):
Radio Waves – “Radio waves are produced by the accelerated motion of charges in conducting wires. They are used in radio and television communication systems. They are generally in the frequency range from 500 kHz to about 1000 MHz. … Cellular phones use radio waves to transmit voice communication in the ultrahigh frequency (UHF) band.”