Introduction to Waves Essential Question: What are similarities and differences between mechanical and electromagnetic waves? (S8P4a) Instructional Approach(s): The teacher should introduce the essential question and the standard that aligns to the essential question

disturbances that transfer energy without carrying matter What are Waves? disturbances that transfer energy without carrying matter Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes

Medium Some waves can only travel through matter. The matter through which a wave travels is called the medium A medium can be solid, liquid, or gas. Examples: Air; water; particles; strings; solids; liquids; gases Other waves that do not need a medium to transfer energy, but can also go through solids, liquids, and/or gases. Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes

Waves that need a medium (matter) to transfer energy: Mechanical Waves Waves that need a medium (matter) to transfer energy: Examples: Sound waves, ocean waves, ripples in water, earthquakes, wave of people at a sporting event Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes

Some examples of Mechanical Waves Instructional Approach(s): The teacher should use the animations on the slide to reinforce mechanical waves.

Two ways to travel

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: waves on a rope 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.

Use the next four slides and your Wave Diagram sheet to label and define the parts of a Transverse wave. 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.

Parts of a Transverse Wave The crest is the highest point on a wave. 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.

Parts of a Transverse Wave The trough is the valley between two waves, is the lowest point. 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.

Parts of a Transverse Wave The wavelength is the horizontal distance, either between the crests or troughs of two consecutive waves. 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.

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. 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.

An ocean wave is an example of a mechanical transverse wave Instructional Approach(s): The teacher should use the illustration on the slide to reinforce parts of a mechanical waves.

Rest Position Instructional Approach(s): The teacher should use the illustration on the slide to reinforce parts of a mechanical waves.

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 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.

Use the next three slides and your Wave Diagram sheet to label and define the parts of a Compressional wave.

Parts of a Compressional Wave (Longitudinal) 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. The compression is the part of the compressional wave where the particles are crowded together.

Parts of a Compressional Wave (Longitudinal) 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. The rarefaction is the part of the compressional wave where the particles are spread apart.

Parts of a Compressional Wave (Longitudinal) 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. The wavelength is the distance from compression to compression or rarefaction to rarefaction in a compressional wave.

Animation of Transverse and Longitudinal Wave Instructional Approach(s): The teacher should use the animation on the slide to reinforce parts of a compressional wave.

Electromagnetic Waves Waves that DO NOT NEED matter (medium) to transfer energy Can travel through a vacuum (empty space). 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. Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes.

Electromagnetic Wave

Electromagnetic Spectrum The electromagnetic spectrum illustrates the range of wavelengths and frequencies of electromagnetic waves. Instructional Approach(s): The teacher should present the information. Teacher may use the electromagnetic spectrum sheet on the resource page to introduce electromagnetic spectrum.

Electromagnetic Spectrum Sheet Instructional Approach(s): The teacher should present the information. Teacher may use the electromagnetic spectrum sheet on the resource page to introduce electromagnetic spectrum.