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10/9 - 7 th Grade Agenda

10/9 - 7 th Grade Agenda. Payday Collect: HW: p.33- 34 Waves and Electromagnetic Spectrum Class Reading: p. 42- 44 HW: Workbook: p. 35- 36. 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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10/9 - 7 th Grade Agenda

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  1. 10/9 - 7th Grade Agenda Payday Collect: HW: p.33- 34 Waves and Electromagnetic Spectrum Class Reading: p. 42- 44 HW: Workbook: p. 35- 36

  2. Electromagnetic Wave • An electromagnetic wave consists of vibrating electric and magnetic field that move through space at the speed of lig____ ht

  3. What are some examples of electromagnetic waves? • Radio Waves • TV Signals • Microwaves • Infrared rays • Light • Ultraviolet rays • X-Ray

  4. 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

  5. Electromagnetic Wavelength

  6. How do we use Radio Waves? • Radio & TV signals • Microwave Oven • Radar • MRI • Cell phone

  7. 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.

  8. How do we use Infrared Rays? • Conventional Oven • Heat Lamps • Thermograms

  9. Visible Light makes up only a small part of the electromagnetic spectrum

  10. Wave • A wave is a disturbance that transfer ene_____ from place to place. • Who can give me examples of waves? rgy

  11. Is light a wave? • Yes • But why?

  12. Picture of Light Wave • Image of a pulse of light that is 2.5 billionths of a millionth of a second long

  13. Energy • In science, energy is defined as the ability to do wo___. rk

  14. Medium • The material through which a wave tra____ is called a medium • Who can give me examples of medium? vels

  15. 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.

  16. Crest gh • Hi___ point of a wave is called a crest

  17. Trough ow • L___ point of a wave is called a trough

  18. Amplitude imum • Amplitude is the max______ distance that the particles of medium carrying the wave move away from their rest positions. • Which rope has higher amplitude?

  19. Wavelength • The distance between two corresp______ parts of a wave is its wavelength. • Which rope has longer wavelength? onding

  20. Frequency • Wave frequency is the num_____complete waves that pass a given point in a certain amount of time ber

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