Which one of the following waves are used by the common TV remote control?
Correct answer: C. Infrared waves
- A. Radio waves
- B. Lasers
- C. Infrared waves
- D. Ultrasonic waves
Explanation
TV remotes usually send coded signals through infrared radiation, which is invisible to the eye and detected by a sensor on the television. Radio and ultrasonic waves are used in other wireless or control applications.
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