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Intro to waves 2020
- 2. Use the PowerPoint to fill in the Waves graphic organizer as we discuss the characteristics of waves
- 3. What are Waves? Rhythmic disturbances that carry energy without carrying matter
- 4. Types of Waves • Mechanical Waves – need matter (or medium) to transfer energy • A medium is the substance through which a wave can travel. Ex. Air; water; particles; strings; solids; liquids; gases • Electromagnetic Waves – DO NOT NEED matter (or medium) to transfer energy • They do not need a medium, but they can go through matter (medium), such as air, water, and glass
- 5. Mechanical Waves Waves that need matter (medium) to transfer energy: Examples: Sound waves, ocean waves, ripples in water, earthquakes, wave of people at a sporting event
- 7. Distributed Summarizing Answer the following question with an elbow partner: Look back at the examples of mechanical waves. If waves transfer energy, which type of mechanical wave do you think transferred the most energy? Why?
- 8. Transverse (Mechanical) Waves • Energy causes the matter in the medium to move up and down or back and forth at right angles to the direction the wave travels. • Examples: Plucking a guitar, • tsunami waves, • Earthquakes, • Ripples in a pond
- 9. Use the next four slides and your Wave Diagram sheet to label and define the parts of a Transverse wave.
- 10. Parts of a Transverse Wave The crest is the highest point on a wave.
- 11. Parts of a Transverse Wave The trough is the valley between two waves, is the lowest point.
- 12. Parts of a Transverse Wave The wavelength is the horizontal distance, either between the crests or troughs of two consecutive waves.
- 13. Parts of a Transverse Wave The amplitude is the peak (greatest) value (either positive or negative) of a wave. The distance from the undisturbed level to the trough or crest.
- 14. An ocean wave is an example of a mechanical transverse wave
- 16. Compressional Wave (longitudinal) • A mechanical wave in which matter in the medium moves forward and backward along the same direction that the wave travels. • Ex. Sound waves A slinky is a good illustration of how a compressional wave moves
- 17. Use the next three slides and your Wave Diagram sheet to label and define the parts of a Compressional wave.
- 18. Parts of a Compressional Wave (Longitudinal) The compression is the part of the compressional wave where the particles are crowded together.
- 19. Parts of a Compressional Wave (Longitudinal) The rarefaction is the part of the compressional wave where the particles are spread apart.
- 20. Parts of a Compressional Wave (Longitudinal) The wavelength is the distance from compression to compression or rarefaction to rarefaction in a compressional wave.
- 22. Electromagnetic Waves Waves that DO NOT NEED matter (medium) to transfer energy Examples: radiation, TV & radio waves, X-rays, microwaves, lasers, energy from the sun, visible light Electromagnetic waves are considered transverse waves because they have similar characteristics; therefore, they have the same parts. More to come on Electromagnetic waves…
- 23. Electromagnetic Spectrum The electromagnetic spectrum illustrates the range of wavelengths and frequencies of electromagnetic waves.
- 24. Electromagnetic Spectrum Sheet 1. Which of the following has the longest wavelength? Microwave Gamma Ray Radio Wave Ultraviolet Light 2. Which of the following has the highest frequency? Microwave Gamma Ray Radio Wave Ultraviolet Light 3. Compare the wavelength and frequency of a radio wave to the wavelength and frequency of a gamma ray. 4. Compare the wavelength of infrared light to the wavelength of ultraviolet light.
Editor's Notes
- #2: Instructional Approach(s): The teacher should introduce the essential question and the standard that aligns to the essential question
- #3: Instructional Approach(s): The teacher should give each student the Waves Notes sheet to use to record important information throughout the lesson
- #4: Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes
- #5: Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes
- #6: Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes
- #7: Instructional Approach(s): The teacher should use the animations on the slide to reinforce mechanical waves.
- #8: Instructional Approach(s): Have students turn to a partner and discuss the question on the slide. Partners can be determined by the students or the teacher can provide more specific directions such as turn to the person directly in front/behind you or to the right/left of you, etc. It may be necessary to have a group of three if you have an uneven number of students. Do not allow more than 30 seconds to 1 minute of discussion time. The teacher should be walking around listening and redirecting discussions as needed. The teacher can briefly discuss student responses.
- #9: Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes. The teacher should use the link to provide examples of mechanical waves.
- #10: Instructional Approach(s): The teacher should give each student the Waves Notes sheet to use to record important information throughout the lesson. Students will be working with both graphic organizers.
- #11: Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes. Make sure that students are labeling the wave on the graphic organizer.
- #12: Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes. Make sure that students are labeling the wave on the graphic organizer.
- #13: Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes. Make sure that students are labeling the wave on the graphic organizer.
- #14: Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes. Make sure that students are labeling the wave on the graphic organizer.
- #15: Instructional Approach(s): The teacher should use the illustration on the slide to reinforce parts of a mechanical waves.
- #16: Instructional Approach(s): The teacher should use the illustration on the slide to reinforce parts of a mechanical waves.
- #17: Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes. Make sure that students are labeling the wave on the graphic organizer.
- #19: Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes. Make sure that students are labeling the wave on the graphic organizer.
- #20: Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes. Make sure that students are labeling the wave on the graphic organizer.
- #21: Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes. Make sure that students are labeling the wave on the graphic organizer.
- #22: Instructional Approach(s): The teacher should use the illustration on the slide to reinforce parts of a compressional wave.
- #23: Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes.
- #24: Instructional Approach(s): The teacher should present the information. Teacher may use the electromagnetic spectrum sheet on the resource page to introduce electromagnetic spectrum.
- #25: Instructional Approach(s): The teacher should present the information. Teacher may use the electromagnetic spectrum sheet on the resource page to introduce electromagnetic spectrum.