Most conventional TV remote control units use infrared (IR) light to transmit signals to the television set. Infrared is a type of electromagnetic radiation with wavelengths longer than visible light, but it is categorized as a form of "light wave".
Which one of the following does a TV remote control unit use to operate a TV set ?
Asked in HPPSC HPAS Prelims 2014 · Topic: Wave Motion (Electromagnetic Waves: Properties, Electromagnetic Spectrum, Energy and Momentum)
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