TV remote এর Carrier frequency -র range কত?
A
< 100 MHZ
B
< 1 GHZ
C
< 2 GHZ
D
Infra-red range এর
Correct Answer: Infra-red range এর
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.