TAKS Objective 5: Wave Interactions Created by Monika Martin & Vernon Ogle

TEKS 5B: Demonstrate wave interactions including interference, polarization, reflection, refraction and resonance with various materials

Waves Longitudinal vs Transverse

Transverse wave characteristics

Look at your TAKS formula chart. What is the velocity of a wave? Velocity = Frequency times the Wavelength v = f x  The velocity (v) of waves are usually measured in meter/second  Wavelengths ( ) are usually measured in meters (The lambda symbol,, represents wavelength)  Frequency (f) of waves are measured in Hertz 6

Reflection When a wave strikes a surface or boundary and bounces back.

Reflection Reflection (buzz word): mirror, surface, rebound, bounce, return, (antonym-absorb)

Reflection of light Reflection only produces an image if the surface producing the reflection of light is perfectly smooth. Absorption is opposite of reflection!

Internal Reflection

Light Color vs Pigment Color Primary colors of light are red, blue and green Combined they make white light. Primary pigments are magenta, cyan, and yellow. Combined they make a material black.

Light Spectrum Absorption of Chlorophyll ( order of colors in spectrum -“roy g biv” )

Seeing color The color you see is the light that is reflected from the object. Other wavelengths are absorbed.

Refraction The bending of light waves when they travel from one medium to another (i.e. from air to water). During this process, the angle of reflection appears to be increase.

Refraction (buzz words): lenses, medium, change speed, bend

Refraction through lenses

Diffraction The bending of a wave around a barrier or emerging through an opening. The smaller the opening the more the waves bend.

Diffraction (buzz words): barrier, opening, spread, bend around

Diffraction of sound

Resonance An effect in which the vibration of one object causes the vibration of another object at a natural frequency (a frequency in which they vibrate).

Resonance (buzz words): natural frequency, harmonic vibration, sound, tuning fork, plucking/striking, string instruments (piano, guitar)

Resonance

Waves Interference (buzz words): combine, constructive, destructive, phase, beats

Polarization The process of transforming unpolarized light (light traveling in all directions) into polarized light (light waves traveling in one direction). This process is accomplished by using a polarizing filter.

Polarization

Polarization (buzz words): filter, align

Polarization

Let’s check your understanding of wave interactions

Which wave interaction is best represented by the illustrations below?

Which wave interaction is best represented by the illustration below?

Which one represents wave amplitude? Which one represents a wavelength?

What type of interference is represented by e

The reflected angle appears to be larger than the incident angle. Which wave interaction is best demonstrated below?

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Which wave interaction is best represented by the illustrations below?

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Which wave interaction is best represented by the illustration below?

What type of interference is represented by c

Which wave interaction is best represented by the illustration below?