Reflection. Reflection- When a wave strikes an object or surface and bounces off.

Transcription

1 Wave Behavior

2 Reflection Reflection- When a wave strikes an object or surface and bounces off. Ex: Echo is reflected sound waves Ex: Mirror reflects light waves If smooth surface the reflected image is clear and sharp If rough or uneven the reflected image is distorted because reflected light scatters

3 Refraction Refraction- The bending of a wave as it moves from one medium into another Ex: Pencil in glass of water looks like it is bending Light waves travel faster in air than in water (Refraction of light going from air through a convex lens, for example, can make images appear larger as the light waves bend.) Larger speed change means a bigger difference (The greater the change in speed of the waves, the more the waves will bend.) Prisms refract light twice and separates colors (rainbow) because each color has a different wavelength Wavelength (Decreasing) Red (longest), Orange, Yellow, Green, Blue, Indigo, and Violet

4 Diffraction Diffraction- Bending of waves around a barrier Sound waves diffract much easier than light waves because they have longer wave lengths than light waves Water does the same around barriers

5 Transmission Transmission of waves occurs when waves pass through a given point or medium. Sound waves are transmitted through solids, liquids, and gases. Light waves are transmitted through transparent materials (may be clear or colored material such as filters) that allow most of the light that strikes them to pass through them. Only a small amount of light is reflected or absorbed. Opaque materials allow no light waves to be transmitted through them. Translucent materials transmit some light, but cause it to be scattered so no clear image is seen.

6 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.

7 When Waves Meet Interference- When two waves combine and form a new wave when they overlap After they overlap the two waves continue to travel on in their original form Constructive interference creates larger waves (crest meets crest) Destructive interference creates smaller waves (crest meets trough) Waves with larger amplitudes carry more energy. Ex: Ocean Waves Use ear protectors to absorb some of the energy carried by sound waves

8 SMALL GROUP ACTIVITIES: Each group has assigned work to do in minutes. After each set time, each group will be going to different stations. 3 groups of students are simultaneously doing work within the given time frame. Group A (7 desks in a row): Digital tool Using your chromebook, click this link to do the virtual lab on wave behaviour. flash/whiteboardcomplete.swf Group B (groups of 12 in the center): Re-teaching of lesson; note-taking & lesson review answering. Group C (groups in the L & R wing): Science worksheet on Waves Behaviour.

9 Practice Test (graded as Home Enrichment): Click the link below er10/section3/section_review_quiz.html