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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

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

electromagnetic wave
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
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
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
how do we use radio waves
How do we use Radio Waves?
  • Radio & TV signals
  • Microwave Oven
  • Radar
  • MRI
  • Cell phone
using microwaves
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
How do we use Infrared Rays?
  • Conventional Oven
  • Heat Lamps
  • Thermograms
slide11
Wave
  • A wave is a disturbance that transfer ene_____ from place to place.
  • Who can give me examples of waves?

rgy

is light a wave
Is light a wave?
  • Yes
  • But why?
picture of light wave
Picture of Light Wave
  • Image of a pulse of light that is 2.5 billionths of a millionth of a second long
energy
Energy
  • In science, energy is defined as the ability to do wo___.

rk

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

vels

does light waves need a medium
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.
crest
Crest

gh

  • Hi___ point of a wave is called a crest
trough
Trough

ow

  • L___ point of a wave is called a trough
amplitude
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?
wavelength
Wavelength
  • The distance between two corresp______ parts of a wave is its wavelength.
  • Which rope has longer wavelength?

onding

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

ber