Light and the Electromagnetic Spectrum - PowerPoint PPT Presentation

Loading...

PPT – Light and the Electromagnetic Spectrum PowerPoint presentation | free to download - id: 735758-ZThmM



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Light and the Electromagnetic Spectrum

Description:

Light and the Electromagnetic Spectrum Light Phenomenon Isaac Newton (1642-1727) believed light consisted of particles By 1900 most scientists believed that light ... – PowerPoint PPT presentation

Number of Views:93
Avg rating:3.0/5.0
Slides: 22
Provided by: Gonza86
Learn more at: http://static.schoolrack.com
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Light and the Electromagnetic Spectrum


1
Light and the Electromagnetic Spectrum
2
Light Phenomenon
  • Isaac Newton (1642-1727) believed light consisted
    of particles
  • By 1900 most scientists believed that light
    behaved as a wave.

3
The Electromagnetic Spectrum
  • The electromagnetic spectrum represents the
    range of energy from low energy, low frequency
    radio waves with long wavelengths up to high
    energy, high frequency gamma waves with small
    wavelengths.

4
  • Visible light is a small portion of this
    spectrum. This is the only part of this energy
    range that our eyes can detect. What we see is a
    rainbow of colors.
  • RedOrangeYellowGreenBlueIndigoViolet
  • ROY G BIV

5
  • The colors we see in objects are the colors that
    are reflected, all other colors are absorbed. A
    red t-shirt appears red because red is reflected
    to our eyes and the other colors are absorbed.
  • When all colors are being reflected we see white
    light (white isnt really a color)

6
  • When all wavelengths of light are being absorbed
    we see black (black also, isnt really a color)

7
Absorption and Transmission
  • Waves that are not reflected are either absorbed
  • OR
  • They are transmitted (pass through the substance)
    like light through a glass window or a pair of
    glasses

8
Refraction
9
(No Transcript)
10
Rainbows are Refracted Light
  • When light waves from the sun pass through a
    droplet of water in the air, the light is
    refracted.
  • The different colors of light travel at different
    speeds through the drop therefore the colors are
    refracted by different amounts RAINBOW

11
Electromagnetic Waves
  • Do not need a medium, CAN travel through empty
    space!
  • Electromagnetic waves (light waves, microwaves,
    x-rays) can travel through empty space

12
TRANSVERSE WAVES
  • Transverse waves move perpendicularly to the
    direction the wave is moving
  • Transverse waves are made up of CRESTS and
    TROUGHS
  • Electromagnetic waves are examples of transverse
    waves.

13
Properties of a Wave
  • 1) AMPLITUDE
  • 2) WAVELENGTH
  • 3) FREQUENCY
  • 4) SPEED

14
Comparing Waves
  • The frequency (v) of a wave is the number of
    waves to cross a point in a specified unit of
    time
  • The wavelength- the distance from crest to crest
    on a wave
  • Amplitude is the greatest distance a wave moves
    away from the rest position the greater the
    distance the more energy

15
Wavelength
  • The distance between any 2 corresponding points
    on a wave

16
Amplitude
17
Wavelength vs Frequency
18
Properties of a Wave
19
Reflection
  • When a wave hits an object through which it
    cannot pass, it bounces back. This is called
    REFLECTION
  • All waves can be reflected

20
  • The Law of Reflection

Angle of incidence Angle of reflection
In other words, light gets reflected from a
surface at the same angle it hits it.
The same !!!
21
Refraction
  • REFRACTION is the bending of waves when waves
    move from one medium to another.
  • When a wave hits a new medium, it changes speed
    and the wavelength changes
About PowerShow.com