Reflection Wave energy bounces back off matter

Example of Reflection

Refraction Bending of a wave as it enters a different medium

Absorption Wave Energy changes to thermal energy and remains in matter

Transmission Wave energy is carried all the way through the matter

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

Light

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?

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

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

Which signal do you think is more reliable?

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