10/4 & 10/5 - 7 th grade agenda learning objective: learn the difference between amplitude and...
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10/4 & 10/5 - 7th Grade Agenda
Learning Objective: Learn the difference between amplitude and frequencyCollect: Reading & Note Taking p.29 – 32Chap 1 TestOptical IllusionsVideo: WavesClass Reading: p. 40 - 41HW: Reading & Notetaking : p. 33- 34
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Daily Reflection
• Prompt: What is the crest of the wave? What is the trough of a wave? Draw a wave and label crest and trough of a wave.
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Wave
• A wave is a disturbance that transfer ene_____ from place to place.
• Who can give me examples of waves?
rgy
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Is light a wave?
• Yes
• But why?
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Picture of Light Wave
• Image of a pulse of light that is 2.5 billionths of a millionth of a second long
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Energy
• In science, energy is defined as the ability to do wo___.rk
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Medium
• The material through which a wave tra____ is called a medium
• Who can give me examples of medium?
vels
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Does Light Waves need a medium?
• Scientist first thought that Light needed to travel through a medium. So they invented the idea of aether in space.
• They look for aether in outer space but they found nothing.
• So, Light Waves can travel without a medium even in a Vacuum of outer space.
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Crest
• Hi___ point of a wave is called a crest
gh
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Trough
• L___ point of a wave is called a trough
ow
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Amplitude
• Amplitude is the max______ distance that the particles of medium carrying the wave move away from their rest positions.
• Which rope has higher amplitude?
imum
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Wavelength
• The distance between two corresp______ parts of a wave is its wavelength.
• Which rope has longer wavelength?
onding
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Frequency
• Wave frequency is the num_____complete waves that pass a given point in a certain amount of time
ber
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Electromagnetic Wave
• An electromagnetic wave consists of vibrating electric and magnetic field that move through space at the speed of lig____ht
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What are some examples of electromagnetic waves?
• Radio Waves• TV Signals• Microwaves• Infrared rays• Light• Ultraviolet rays• X-Ray
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How fast do electromagnetic waves travel?
• It is the fastest thing in the universe• 300,000 km per second• 186,000 miles per second• It takes 8 minutes for light to travel from the sun
to the earth• It takes 3 million years for light to travel from the
nearest galaxy (andromeda) to the earth
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Electromagnetic Wavelength
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How do we use Radio Waves?
• Radio & TV signals
• Microwave Oven
• Radar
• MRI
• Cell phone
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Using Microwaves
• Why do you see sparks you put metal objects in a microwave?
• Because of the build up of electrical energy in the metal
• The long wave length of Microwaves can pass right through glass and plastic. That is why microwaves do not heat glass and plastic containers.
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How do we use Infrared Rays?
• Conventional Oven• Heat Lamps• Thermograms
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Visible Light makes up only a small part of the electromagnetic
spectrum
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Optical Illusions