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: NCERT Class 12 Physics, Ch 8 'Electromagnetic Waves'_
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