106 107 7 th Grade Agenda Learning Objective
10/6 & 10/7 - 7 th Grade Agenda üLearning Objective: Learn about waves and Electromagnetic Spectrum üCollect HW: Reading & Notetaking : p. 33 - 34 üPassback Graded HW & Test üChange Job üFroguts Lab (Cow Eye Dissection) üClass Reading: p. 43 - 46 üHW: Parent Signature on Grade Printout üHW: Reading & Note taking : p. 35 - 36
Daily Reflection • Prompt: What is the amplitude of a wave? What is the wavelength of a wave. Draw a wave and label its amplitude and wavelength.
Amplitude imum distance that • Amplitude is the max______ the particles of medium carrying the wave move away from their rest positions. • Which rope has higher amplitude?
Wavelength • The distance between two corresp______ onding parts of a wave is its wavelength. • Which rope has longer wavelength?
Frequency • Wave frequency is the num_____complete waves that ber pass a given point in a certain amount of time
Electromagnetic Wave • An electromagnetic wave consists of vibrating electric and magnetic field that move through space at the speed of lig____ ht
What are some examples of electromagnetic waves? • • Radio Waves TV Signals Microwaves Infrared rays Light Ultraviolet rays X-Ray
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
Electromagnetic Wavelength
How do we use Radio Waves? • • • Radio & TV signals Microwave Oven Radar MRI Cell phone
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.
How do we use Infrared Rays? • Conventional Oven • Heat Lamps • Thermograms
Visible Light makes up only a small part of the electromagnetic spectrum
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