2. Reflection
Wave energy bounces back off matter

3. Example of Reflection

4. Refraction
Bending of a wave as it enters a different medium

5. Absorption
Wave Energy changes to thermal energy and remains in matter

6. Transmission
Wave energy is carried all the way through the matter

7. Diffraction
The change in direction of a wave when it travels past the edge of an object or through an opening.

8. Light

9. Reflection
•Penny in a Beaker
–Look at it from above at different angles and from the side… what do you see? Why do you think it looks like that?

10. Digital Signal Signal comes in wave pulses
Signaling on and off
The pulses translate to a code of 1’s and 0’s

11. Analog Signals
Analog Signals are continuous waves that vary in strength and quality
The variation of the waves amplitude turns into the message or signal
Example: human voices, ocean waves, dimmer switches

12. Which signal do you think is more reliable?

13. Digital signals carry more information per second than analogue signals
Digital signals maintain their quality over long distances better than analogue signals