1. Unit: Sound and Light
Lesson 3: Wireless Communication
Essential Questions:
1.) How do radio waves transmit information?
2.) How does a cell phone work?
3.) How does satellite communication work?

2. What are the two broadcasting signals?
A method of broadcasting signals by changing the amplitude of a wave is called amplitude modulation

3. A method of broadcasting signals by changing the frequency of a wave is called frequency modulation

4. How does a cell phone work?
Cell phones transmit and receive signals using high frequency microwaves.

5. A cell phone sends out microwaves tagged with a unique number.
2. A tower picks up the microwaves
and sends it to a hub.
3.The hub sends the microwaves to
a receiver (tower or hub).
4. The receiver transmits the signal
to the receiving cell phone.

6. How does satellite communication work?
Communication satellites receive radio, television and telephone signals and relay the signals to receivers on Earth.