Which one of the following waves are used in the common TV remote controls?
A. Radio waves
C. Ultrasonic waves
D. Infrared waves
The remotes which have led Infrared are definitely by IR you can check it out by using your mobile camera the glow of blub can’t be observed with naked eye but can be observed with camera. Open camera point towards led and press any button if it is working properly you will observe
Modern android tv remote control thought Bluetooth use radio waves.
Answer : D. Infrared waves