Remote controls work through sending electro
magnetic waves through the air that the TV can
pick up. The control sends out infrared waves
which is a type of electromagnetic radiation, which
includes radio, gamma, and micro waves, as well as
all visible light.
We can not see the infrared light, as its
frequency is a little too low for humans to
detect, however it is sent out using a Light
Emitting Diode, (or LED) that works in the
same way an LED TV screen sends out light. These
infrared waves are sent spherically in all
directions, and a sensor in front of the TV picks
up the wave traveling at light speed.
The remote does not just send a single infrared
wave. In a way similar to morse code, the TV
remote sends out a burst of multiple energy waves.
The TV detector picks up these waves in
succession, and based on the configuration,
performs the desired task.
Hope this was helpful
Most television remotes use IR (infrared)
waves to send signals. These waves behave just
like visible light, except that humans can't see
them. This is because they have a different,
longer wavelength than visible light.
Using our knowledge of this wavelength, we can
still make electronic sensors to detect infrared
light. There are quite a few ways to do this, and
they usually involve a special material that
behaves differently when hit by infrared light.
These sensors, or photodetectors, are in the
receivers that pick up television remote signals.
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