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Household TV remote switches work using:

AInfrared
BMicrowaves
CUltraviolet
DGamma rays
Answer & Solution
Correct answer: A. Infrared
1. The remote must send a short signal across a room. 2. It uses a band just beyond visible red. 3. That is infrared. 4. So the answer is infrared. _Source: syllabus Physics, Ch 8 'Electromagnetic Waves'_
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