Wave Behaviors 8.P.3A.3 – 8.P.3A.4

1.Sit quietly. 2.Copy the homework in your agenda. 3.Add pgs into your Table of Contents. Pg.44 4.On Pg.44, add the following words to the foldable and write their definitions. Refraction Refraction Reflection Reflection Transmission Transmission Absorption Absorption

Refraction Refraction is the bending of waves caused by a change in their speed as they pass from one medium to another. As waves pass at an angle from one medium to another, they may speed up or slow down. The greater the change in speed of the waves, the more the waves will bend.

Concave lenses are thin in the middle. – They bend light waves to produce smaller images. Convex lenses are thicker in the middle. – They bend light waves to produce larger images.

Prisms can also bend light waves. Prisms or diffraction gratings separate white light into its different components or colors by bending the light at different angles depending on the frequencies of the light passing through the prism or diffraction grating. Different colors of light have different frequencies.

Reflection Reflection is the bouncing back of a wave when it meets a surface or boundary that does not absorb the entire wave’s energy. All waves can be reflected.

Reflections of sound waves, for example, are called echoes and help bats and dolphins learn about their environments. Plane mirrors Plane mirrors and other smooth surfaces reflect light to form clear images.

 If the surface is smooth, the reflected angle is the same.  If the surface is rough, the angle of reflection is scattered.

Transmission Transmission of waves occurs when waves pass through a given point or medium. Sound waves are transmitted through solids, liquid, and gases.

transparent Light waves are transmitted through transparent materials (may be clear or colored material such as filters). Only a small amount of light is reflected or absorbed.

Opaque Opaque materials allow no light waves to pass through them. Translucent Translucent materials transmit some light, but cause it to be scattered so no clear image is seen.

Absorption Absorption of certain frequencies of light occurs when the energy is not transferred through, or reflected by, the given medium. Objects or substances that absorb any wavelength of electromagnetic radiation become warmer and convert the absorbed energy to infrared radiation.

White light can be separated into the colors of the spectrum – ROY G BIV Objects have different colors because each object reflects and absorbs different frequencies of light. Ex: Red apples are red because the apple reflects red and absorbs all of the other colors. Ex: Red apples are red because the apple reflects red and absorbs all of the other colors.

Add to notebook pg.46 Answer the questions using today’s notes and prior knowledge of waves.

1.Sit quietly. 2.Copy the homework in your agenda. 3.Add pgs into your Table of Contents. Pg.44 4.On Pg.44, add the words to your foldable and write their definitions. Transparent Transparent Opaque Opaque Translucent Translucent Convex lens Convex lens

Waves interfere with each other. constructive Interference may be constructive: – A crest will interfere with another crest constructively to produce a larger crest and a trough will interfere to produce a larger trough. – Compressions interfere constructively with each other as do rarefactions.

destructive Interference may be destructive: – A crest will interfere with a trough to lessen or cancel the displacement of each. – Compressions interfere with rarefactions to lessen or cancel the displacement of each.

Sound waves interfere with each other changing what you hear. Sound waves interfere with each other changing what you hear. – Destructive interference makes sounds quieter; constructive interference makes sounds louder. – Sound waves reflect in tubes or some musical instruments to produce standing waves which reinforce sound through constructive interference to make the sound louder.

Directions: 1.Cut out the entire organizer. 2.Fold along the dotted line. 3.Glue the organizer into your notebook behind the first and second wave row. 4.Then complete the table with an illustration of the resultant wave and an explanation of what happened.

Directions: 1.Cut out the table and cards. 2.Sort the pictures and definitions so to correctly describe each wave behavior. 3.After you get them checked, glue them down in your notebook.

1.Sit quietly. 2.Copy the homework in your agenda. 3.Add pgs into your Table of Contents. Pg.50 4.On Pg.50, complete the card sort activity about transmission materials. 1. Cut out the table and cards. 2.Sort the cards on the table correctly. 3.Use your notes if you need help. 4.Glue down.

1.Add the lab sheet to your notebook on pg Listen carefully to instructions and watch demonstrations for each station minutes for each station 4.We will finish tomorrow

1.Sit quietly. 2.Copy the homework in your agenda. Pg.44 3.On Pg.44, add the words to your foldable and write their definitions. Prism Prism Interference Interference Constructive Constructive Destructive Destructive When 2 waves interfere and add together to produce a larger wave. When 2 waves interfere and cancel each other out.

Finish your remaining lab stations. Write your 5-8 sentence summary. When you are done, on a clean sheet of paper write your name and number it 1-40 (single spaced). We will review for the quiz with task card questions!

1.Sit quietly. 2.Copy the homework in your agenda. 3.Group leaders submit notebooks. 4.In your groups, sort the cards in the baggie on your tables. Match each term with its definition and illustration.

After you submit your quiz read textbook pgs Exit Ticket: Answer questions #1-5 on pg.562 on a sheet of paper with your name on it.