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Question
TV remote এর Carrier frequency -র range কত?
< 100 MHZ
< 1 GHZ
< 2 GHZ
Infra-red range এর
ANSWER : 4
Descrption
Infrared light is even used to heat food sometimes - special lamps that emit thermal infrared waves are often used in fast food restaurants! Shorter, near - infrared waves are not hot at all - in fact you cannot even feel them. These shorter wavelengths are the ones used by your TV's remote control.
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