Joie Tsang

1
Radio Waves

• Joie Tsang
• Caroline Nunberg
• Sarah Sylvia

2
The name of our speck of the EM spectrum is
Radio Wave.
3
WAVELENGTH

• Radio waves have wavelength between 100,000
  meters and 0.001 meters.

4
FREQUENCY

• Radio waves have a range of frequency between 3
  KHz and 300 GHz.

5
Where does is fit in the spectrum?

• Radio waves are at the top of the electromagnetic
  spectrum.
• This speck is right above microwaves.

6
Uses and Applications for This Type of Energy
COMMUNICATION
7
Cell Phones

• System of separated zones called cells.
• Each cell has a base station that receives and
  sends out radio waves.

8
Placing a Call

• A signal is sent from the cell phone antenna to
  its base station antenna.
• The base assigns the phone to a radio frequency
  channel.
• The set radio signals are simultaneously received
  and sent.
• The base station transfers the call so it reaches
  another phone.

9
Television

• For cable, the radio frequency signals are
  transmitted through the fixed optical fibers
• For traditional TV broadcasting it is done
  through radio waves that requires an antenna.
• The antenna receives the picture and puts it on
  your screen.

10
RADIO

• The transmitter at the radio station has
  converted the sound waves into electromagnetic
  waves.
• They are put into electromagnetic waves in the
  radio in the radio frequency range.
• The radio receives the radio waves, decodes the
  info, and the speaker changes it to a sound wave.

11
Remote Control Toys

• Transmitter- the controller
• Sends radio waves to the receiver
• Receiver- antenna and circuit board inside the
  toy
• Receives the radio wave signals and activates the
  motors in the toy.

12
Submarines

• Submarines can receive very or extremely low
  frequency radio waves.
• They travel through the water and reach the
  submarine.
• This allows communication to the outside world.

13
Are Humans and Other Organisms able too see radio
waves?

• No, radio waves are an invisible form of
  electromagnetic radiation.
• Radio waves travel through air and space in a
  straight line.
• They can travel through solid objects like
  buildings or people- unlike light waves.

14
Is This Damaging to Humans?

• There is no evidence that it is harmful.
• Large doses of radio waves are believed to cause
  cancer, leukemia, and other disorders (only in
  children).
• One man cured his wifes cancer using radio waves.

15
This Is What He Did

• John Kanzius cured his wifes cancer using a pie
  pan and hot dogs.
• He gave a little shock, and it killed the cancer
  cells.

16
One box sends radio waves over to the other,
creating enough energy to activate gas in a
fluorescent light. He put his hand in the field
to demonstrate that waves are harmless to humans.
He injected the hot dog with sulfate and took the
probe right at the injection site.
When the shock was given, it killed the cancer
cells.
17
Discovery!

• Heinrich Hertz - 1888
• Worked with Maxwell- proposed equations
• Produced electromagnetic waves
• Measured the velocity and wavelength

18
DID YOU KNOW...
19
Radio waves can be as big as a football field or
as small as a football.
20
Naturally produced radio waves are produced by
lightening, sparks, and stars. This is why you
hear interference on your radio during a storm.
21
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