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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

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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

  • 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


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?

  • Yes

  • But why?


Picture of Light Wave

  • Image of a pulse of light that is 2.5 billionths of a millionth of a second long


Energy

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

rk


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?

  • 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

gh

  • Hi___ point of a wave is called a crest


Trough

ow

  • L___ point of a wave is called a trough


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

  • The distance between two corresp______ parts of a wave is its wavelength.

  • Which rope has longer wavelength?

onding


Frequency

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

ber


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