Discussion
Which wave is being used by common TV remote control ?
Answer: C
A TV remote uses Infrared waves (printed 'Infared').
The remote has an infrared LED that sends coded pulses of light just beyond the red end of the visible spectrum, and a sensor on the television decodes them. That is why the remote must point at the set with nothing in the way.
Radio waves and microwaves are used by Wi-Fi, Bluetooth and some newer remotes, not the common infrared type. Ultrasonic remotes, which signalled with sound, appeared in some early sets but are not the common kind.
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