Daily TAKS Connection: Wave Types, Characteristics, and Interactions

1
Daily TAKS ConnectionWave Types,
Characteristics, and Interactions

• IPC(5) The student knows the effects of waves on
  everyday life. The student is expected to
• (A) demonstrate wave types and their
  characteristics through a variety of activities
  such as modeling with ropes and coils, activating
  tunings forks, and interpreting data on seismic
  waves..
• (B) demonstrate wave interactions including
  interference, polarization, reflection,
  refraction, and resonance within various
  materials.

2
Foldable Instructions

• Construct a two door, shutter fold foldable
• Materials
• Foldable handout
• Scissors
• Pen
• Colored pencils/crayons

• Instructions
• Fold the paper along the solid fold lines (front
  side facing you)
• Record your name, date and period on the reverse
• Color the 2 doors (transverse wave, compression
  wave) each a different color

3
Compression Waves

• rarefaction-the less dense region of a
  compression wave
• compression-the more dense region of a
  compression wave
• wavelength-measured from the start of one
  compression to the start of the next compression
• TASK Match the letter with the corresponding
  wave characteristic under the compression wave
  door.

wavelength
4
Transverse Waves

• has crests and troughs
• crest high point of the wave
• trough low point of the wave
• wavelength from crest to crest or trough to
  trough
• Amplitude is distance from crest or trough to the
  resting position of the wave
• larger the amplitude, the greater the energy
• TASK Following the instructions on the LH side
  under the transverse wave door of your foldable

5
Velocity of a Wave

• Frequency - number of waves that pass a fixed
  point per second
• measured in hertz (Hz) waves/second (1/s)
• for sound waves, determines the pitch of the
  sound (how high or how low a note sounds)
• Velocity speed and direction of a wave
• measured in meters per second (m/s)
• Wavelength
• Measured in meters (m)

6
Tasks

• Using the velocity of a wave equation found on
  the formula chart, solve the problem shown under
  the compression wave door, RH side
• Answer the question under the transverse wave
  door, RH side

7
Lets review Interactions

• Constructive Interference
• waves add up

• Destructive Interference
• waves cancel each other

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Reflection

• Reflection
• incident beam
• normal
• reflected beam
• the law of reflection states that the angle of
  incidence equals the angle of reflection

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Refraction

• Refraction
• bending of light when changing mediums
• depends on speed of light in each medium
• light bends toward normal when slowing down and
  away from normal when speeding up.

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Resonance

• Resonance
• the ability of an object to vibrate at natural
  frequency when it absorbs energy
• standing waves vibrate at natural frequencies
• example rim of glass, strings on a violin, bells

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Polarization

• Polarization
• when light vibrates in one direction
• Ex. Polarizing sunglasses

12
Apply Your Knowledge

• Using the cards, match the wave interaction with
  its definition and the picture that shows that
  type of interaction.
• Begin Matching Now!!

13
Question

• When trying to catch a fish in water, a bear
  needs to take into account the way light bends as
  it moves from water into air or it will miss the
  fish and go hungry. The bending of light as it
  passes from one medium into another is known as

14
Question

• Diverging lenses are useful to people who
• suffer from nearsightedness because the
• lenses can cause images of distant objects to
• be focused on the retina. Lenses allow images
• to be focused on the retina because of

15
Question

• One tuning fork is struck and placed next to an
  identical fork. The two forks do not touch. The
  second tuning fork starts to vibrate because of

16
Question

• 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?

17
Question

• The image on the screen is inverted because light
  rays
• A. condense as they pass through the pinhole
• B. travel through the opening in straight lines
• C. refract as they strike the screen
• D. are polarized by the materials of the screen

18
Question

• When a DVD is read, laser light touches the DVD
  surface and is then measured at location A. What
  allows light to return to location A after
  striking the DVD surface?

19
Question

• An empty cup was tightly covered with plastic
• wrap, and a few grains of salt were sprinkled
• on top of the plastic. When a tuning fork was
• struck and placed slightly above the plastic
• wrap, the salt began to move. Which
• characteristic of waves does the movement
• of the salt best demonstrate?

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Last Question!

• Calculate the velocity of the wave shown?