Daily TAKS Connection: Wave 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.

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

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

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

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)

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

Let’s review Interactions Constructive Interference waves add up Destructive Interference waves cancel each other

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

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.

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

Polarization when light vibrates in one direction Ex. Polarizing sunglasses

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!!

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 –

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 —

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 –

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?

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

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?

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?

Last Question! Calculate the velocity of the wave shown?