Let's Catch a Wave Tutoring session for TEK I5B – demonstrate wave interactions including interference, polarization, reflection, refraction, and resonance within various materials

Types of Waves and Forms of Energy Sound Electromagnetic radiation: Radio Microwave Light (visible) Ultra-violet X-Rays Electrons (tiny negative particles of an atom)

Parts of a Wave – WAVE DIAGRAMS crest Frequency - # of wavelengths that pass a fixed point each second Amplitude - distance from the midpoint to the crest or trough (height) midpoint trough

Interesting Behaviors of WAVES Reflection Refraction Interference Diffraction Resonance Polarization

Refraction vs. Reflection Waves move from their source in a straight line that is until… they run into something Reflection = waves bounce off a surface (mirror, water, snow, shiny metals, etc.) Refraction = waves bend as they travel through a different medium (air, water etc.) (pencil in a glass of water – it looks split)

Diffraction is the movement of waves around an object or through a small opening Example: Every shore on an island has incoming waves; Why? the waves change direction and bend around the island Example: A wave approaching a barrier will pass through the opening in the barrier and continue in the same pattern.

Interference = when 2 waves meet and a combined wave is formed Constructive –the ending wave is bigger Destructive – the ending wave is smaller

Resonance – ability of an object to vibrate by absorbing energy at its natural frequency. Examples: Tuning fork will vibrate when another is vibrating a few meters away Soldiers “break step” when crossing bridges so as not to match the natural frequency of the bridge & cause collapse

Polarization =light is made to travel in one direction Polarized Light – light in which transverse waves vibrate in only one direction Polarized Sunglasses – help keep light out of eyes, but still allow you to see clearly

Let’s sum this thing up … Match wave behaviors to the correct situation: Light waves are filtered; only move horizontally Waves bend around a barrier Two or more waves meet and the amplitude increases A flower stem appears to be “broken” when observed in a clear vase with water Waves bouncing off of a surface such as water, snow, or a shiny metal RESONANCE INTERFERENCE REFRACTION REFLECTION POLARIZATION DIFFRACION 1 – E 2 – F 3 – B 4 – C 5 - D

through the opening in the barrier? (A) (B) (C) (D) 1. The diagram above shows waves approaching a barrier. Which pattern will be formed after the waves pass through the opening in the barrier? (A) (B) (C) (D) B

A guitar player is seated next to a piano A guitar player is seated next to a piano. The piano player strikes an E key on the piano. The guitarist reports that this causes the E string on his guitar to vibrate. What is the name of this phenomenon? Resonance Polarization Reflection Diffraction A

3. Which of these tools is most useful in identifying the wavelengths of visible light? (F) Convex lens (G) Spectroscope (H) Microscope (J) Concave mirror G

4. Which label on the model represents a wavelength? (F) Q (G) R (H) S (J) T F

The pitch of a sound made by plucking a guitar string is determined by the Frequency of the vibration produced Strength of the plucking force Distance between the strings Shape of the guitar body A