Introduction To Waves
Introduction to WavesEssential Question:What are the characteristicsof mechanical andelectromagnetic waves?(S8P4a,d,f)
Use the PowerPoint to fill in theWaves graphic organizer as wediscuss the characteristics of waves
What are Waves?Rhythmic disturbances that carryenergy without carrying matter
Types of Waves Mechanical Waves – need matter (ormedium) to transfer energy A medium is the substance throughwhich a wave can travel. Ex. Air; water;particles; strings; solids; liquids; gases Electromagnetic Waves – DO NOT NEEDmatter (or medium) to transfer energy They do not need a medium, but theycan go through matter (medium), such asair, water, and glass
Mechanical WavesWaves that need matter(medium) to transfer energy:Examples: Sound waves, oceanwaves, ripples in water,earthquakes, wave of people ata sporting event
Some examples ofMechanicalWaves
Distributed SummarizingAnswer the following question with anelbow partner:Look back at the examples ofmechanical waves. If waves transferenergy, which type of mechanicalwave do you think transferred themost energy? Why?
Transverse(Mechanical) Waves Energy causes the matter in the mediumto move up and down or back and forthat right angles to the direction the wavetravels. Examples: waves in water /waves/intro/video/Creating a Transverse Wave.mov /waves/intro/wavesVibration.html
Use the next four slides and your WaveDiagram sheet to label and define theparts of a Transverse wave.
Parts of aTransverse WaveThe crest isthe highestpoint on awave.
Parts of aTransverse WaveThe trough isthe valleybetween twowaves, is thelowest point.
Parts of a Transverse WaveThe wavelength is the horizontaldistance, either between the crests ortroughs of two consecutive waves.
Parts of a Transverse WaveThe amplitude is the peak (greatest) value(either positive or negative) of a wave. Thedistance from the undisturbed level to thetrough or crest.
An ocean wave is an example ofa mechanical transverse wave
Compressional Wave (longitudinal) A mechanical wave in which matter in the mediummoves forward and backward along the samedirection that the wave travels. Ex. Sound wavesA slinky is a good illustrationof how a compressional wavemoves
Use the next three slides and your WaveDiagram sheet to label and define theparts of a Compressional wave.
Parts of a CompressionalWave (Longitudinal)The compression is the part of thecompressional wave where the particlesare crowded together.
Parts of a CompressionalWave (Longitudinal)The rarefaction is the part of thecompressional wave where the particlesare spread apart.
Parts of a CompressionalWave (Longitudinal)The wavelength is the distance fromcompression to compression or rarefaction torarefaction in a compressional wave.
Animation of Transverse andLongitudinal /physics/home/animations3/waves/wavemotion.html
Electromagnetic WavesWaves that DO NOT NEED matter(medium) to transfer energyExamples: radiation, TV & radio waves,X-rays, microwaves, lasers, energy fromthe sun, visible lightElectromagnetic waves are consideredtransverse waves because they havesimilar characteristics; therefore, theyhave the same parts.More to come on Electromagnetic waves
Electromagnetic SpectrumThe electromagnetic spectrum illustratesthe range of wavelengths and frequenciesof electromagnetic waves.
Electromagnetic Spectrum Sheet1. Which of the following has the longest wavelength?MicrowaveGamma Ray Radio WaveUltraviolet Light2. Which of the following has the highest frequency?MicrowaveGamma Ray Radio WaveUltraviolet Light3. 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.
Summarizing StrategyTypes of Waves Quad Clusters1.Sound WaveOcean WaveWave on a ropeStadium WaveWhich one does not belong? Why?2.MicrowaveX-rayLaserSound WaveWhich one does not belong? Why?3.RadiationRadio SignalLightEarthquakeWhich one does not belong? Why?4.Sound WaveRipple in waterGuitar StringTV SignalWhich one does not belong? Why?
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 simi
electromagnetic waves, like radio waves, microwaves, light, and x-rays are examples of transverse waves. Longitudinal waves travel through a medium in a direction parallel to the direction of travel of the wave. Mechanical waves such as sound waves, seismic waves created by earthquakes, and explosions are all examples of longitudinal waves.
Q: What are mechanical waves? A: Waves that require a medium in which to travel. A medium is the _ that waves travel through o Mediums can be solid, liquid, or gas Examples of mechanical waves include sound waves, seismic waves, ocean waves, etc Q: Describe two types of mechanical waves.
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College physics Semester 2 Unit 2 What is a wave? How do they act? How are do waves differ? 1/29 Pre-test Waves on a String. Notes: Introduction to Waves . Lab: Waves on a String Activity (PhET) Do: read 12.3 p457 (1,3,5) 1/30 Clicker questions: Waves on a String. Lab: Fourier-Making Waves part 1 (PhET) 2/1 Lab: Fourier-Making Waves part 2 (PhET)
electromagnetic waves we can see. We see these waves as the colors of the rainbow. Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength. When all the waves are seen together, they make white light. Visible light waves are the only electromagnetic waves we can see.
Properties of EM Waves Electromagnetic waves are transverse waves Electromagnetic waves travel at the speed of light Because em waves travel at a speed that is precisely the speed of light, light is an electromagnetic wave Electromagnetic waves carry energy as they travel through space, and this energy can be transferred to objects
A wave a moving disturbance. (Sound, water waves, etc. make some material substance move as they go by. Electromagnetic waves, such as light or radio waves, make electric and magnetic fields change strength.) Transverse waves: The medium is displaced perpendicular to the direction of propagation. Examples: light, string waves, water waves .
Waves and Thermodynamics MASTERING PHSICS 3.4 Electromagnetic Waves Conduct investigations to explain and analyse differences between mechanical and electromagnetic waves. Electromagnetic waves Electromagnetic transverse waves are different from transverse matter waves in that they: Can travel through a vacuum.
