KARAKTERISTIK GELOMBANG KELAS XI TP 22 23.pptx

KARAKTERISTIK GELOMBANG UNTUK SISWA SMA KELAS XI

1. Waves – PowerPoint Template Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras finibus pretium vehicula

2. Waves Electromagnetic Waves Mechanical Waves do not require a medium require a medium Waves transverse wave longitudinal wave earthquake s-waves earthquake p-waves Ex: light Ex: sound transverse wave

3. Wave Pulses

4. End of Section: Properties of Waves

5. When an object or wave hits a surface through which it cannot pass, it bounces back. - Interactions of Waves Reflection

6. Reflection Reflection is when waves, whether physical or electromagnetic, bounce from a surface back toward the source. A mirror reflects the image of the observer. NORMAL

7. - Interactions of Waves Refraction When a wave enters a new medium at an angle, one side of the wave changes speed before the other side, causing the wave to bend.

8. Refraction Refraction is when waves, whether physical or electromagnetic, are deflected when the waves go through a substance. The wave generally changes the angle of its general direction.

9. Refraction

10. - Interactions of Waves Diffraction When a wave moves around a barrier or through an opening in a barrier, it bends and spreads out.

11. Diffraction Diffraction is when a wave goes through a small hole and has a flared out geometric shadow of the slit. a characteristic of waves of all types We can hear around a corner because of the diffraction of sound waves. For instance, if a wall is next to you when you yell, the sound will parallel the wall. The wall may stop, but the voice doesn't; sound will almost turn the corner of the wall.

12. http://www.acoustics.salford.ac.uk/schools/teacher/lesson3/flash/whiteboardcomplete.swf

13. INTERFERENCE Interference occurs when the combination of two or more waves exist in the same place at the same time. Constructive interference = bigger wave. Destructive interference = smaller wave.

14. - Interactions of Waves The interference that occurs when waves combine to make a wave with a smaller amplitude is called destructive interference . Link to animation of interference and standing waves. Another cool animation!

15. Wave Interference Activity Click the Active Art button to open a browser window and access Active Art about wave interference. - Interactions of Waves

16. - Interactions of Waves Standing Waves If the incoming wave and a reflected wave have just the right frequency, they produce a combined wave that appears to be standing still. ex: Jump rope Link to standing wave animation- watch for >1 min

17. Standing Waves Nodes: Point of zero amplitude Nodes are always spaced evenly throughout the standing wave. Antinodes: point of maximum amplitude (MAX energy)

18. Resonance Most objects have a natural frequency of vibration If a nearby object vibrates at the same frequency this can cause resonance. Examples: instruments Show water glass demonstration

19. Doppler Effect https://www.youtube.com/watch?v=h4OnBYrbCjY

20. Question Answer Asking Questions Before you read, preview the red headings. In a graphic organizer like the one below, ask a what , how , when , or where question for each heading. As you read, write answers to your questions. How are waves reflected? Waves are reflected when they hit a surface through which they cannot pass and bounce back. What is refraction? The bending of waves due to a change in speed When does diffraction occur? When a wave moves around a barrier or through an opening in a barrier What is a standing wave? A wave that appears to stand in one place even though it is really two waves interfering - Interactions of Waves

21. End of Section: Interactions of Waves

22. Graphic Organizer Longitudinal Waves can be Transverse can be contain contain contain contain Crests Rarefactions Troughs Compressions

23. End of Section: Graphic Organizer