Radios work by transmitting information
radio waves . Radio waves behave like
visible light waves —they travel long distances in
Imagine you are standing across from a friend
in an open field. If you had a flashlight, you
could send your friend a code (for example, morse
code) by turning your flashlight on and off in a
pattern. Your friend would see the flashes of
light, and could interpret your message. In this
way, they would be using their eyes to capture the
signal from the flashlight.
Just like sending signals to a
friend over a distance using a flashlight,
radio waves can be used to send
information. Unlike the light from a
flashlight, though, we can’t use our eyes to
capture the information from radio waves.
Instead, a radio uses an antenna to capture the
radio waves sent by the radio broadcaster. The
information contained in the waves is then
converted into the sound that you hear.
An advantage of radio waves over light waves
is that radio waves can pass through most
objects, so you can receive the radio waves
despite obstacles (or when you are inside).
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