Page 205 - DK Children's Encyclopedia

Radio SEE ALSO

▸ ▸ Atmosphere p.33
▸ ▸ Books p.44
Radios pick up signals and turn them into sounds we can ▸ ▸ Communication
hear. They do this by using invisible waves that carry p.69
sound information. Thousands of different radio stations ▸ ▸ Hearing p.127

play music, news, and drama to listeners all over the world. ▸ ▸ Navigation p.182
▸ ▸ Television p.251

How radio works
Radio towers turn sounds into
radio waves. Radios pick up
these waves and turn them 2. Radio waves
back into sounds that Invisible radio waves carry 3. Radio antenna
you can hear. sounds from radio towers to An antenna is a thin
radios in the home.
metal rod that picks
1. Radio tower up radio waves.
Radio towers have
antennas on the top of
them. These antennas
send out radio waves.

Radio waves travel
at the speed of
light—about
186,000 miles
(300,000 km)
a second!

4. Speaker
The radio’s
speaker plays the
waves as sounds.

Radio towers
are tall to make
sure that radio
waves can travel
over buildings.

Remote Controller
control
Digital radio Wireless gadgets use
Instead of radio waves, radio waves to contact
each other. For example,
digital radio uses digital a remote control can
signals that don’t get broken tell a toy car how to
up like radio waves do. This move around.
means they sound better. Remote control toy car

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