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

WavesLongitudinal vs Transverse

WavesLongitudinal 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

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Reflection

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

Reflection

Reflection: mirror, surface, rebound, bounce, return, (opposite of “absorb”)

Reflection of light

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

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.

• If all colors of light are reflected, the object will be white

• If no colors of light are reflected, the object will be black

Refraction• The bending of light waves when they travel

from one medium to another (i.e. from air to water).

Refraction: 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: 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: natural frequency, harmonic vibration, sound, tuning fork,

plucking/striking, string instruments (piano, guitar)

Resonance

Waves Interference: 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

Polarization: filter, align

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?

?

Which wave interaction is best represented by the illustrations below?

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Which wave interaction is best represented by the illustration below?

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?