Presentation is loading. Please wait.

Presentation is loading. Please wait.

What is Light?. What Is Light? Energy! Energy…. Usually needs a medium for transmission. Ex. Heat transfers by convection or conduction.

There are copies: 1
What is Light?. What Is Light? Energy! Travels like a wave A small packet of light energy is called a Photon.

Similar presentations


Presentation on theme: "What is Light?. What Is Light? Energy! Energy…. Usually needs a medium for transmission. Ex. Heat transfers by convection or conduction."— Presentation transcript:

1 What is Light?

2 What Is Light? Energy!

3 Energy…. Usually needs a medium for transmission. Ex. Heat transfers by convection or conduction.

4 Light Energy….. Travels through the vacuum of outer space….. Transferred by radiation in the form of an electromagnetic wave

5 Properties of Light Travels in straight lines. Travels VERY fast. - travel at a speed of 3.00 X 10 8 m/s

6 Electromagnetic Waves An electromagnetic wave is a wave of energy that moves through space

7 Different electromagnetic waves have different lengths which give them different amounts of energy

8 Electromagnetic Spectrum

9 Gamma rays X-rays Ultraviolet light Visible light Infrared light Microwaves Radio waves (pg. 466)

10 But we dont see radio waves and x-rays…..

11 Our ears can not hear some high sound frequencies that dogs can. Similarly our eyes can not see some of the wavelengths of light.

12 Visible Light! Any electromagnetic wave that the human eye can detect. Called the Visible Spectrum.

13 - white light breaks into the colours of a rainbow when it passes through a prism. - white light is made of all the colours of the visible spectrum

14 Similarly…. A rainbow appears in the sky from the suns rays.

15 So….when light from the sun is broken down, its spectrum looks like The suns light is therefore White Light.

16 When light from some sources is broken down, its Spectrum looks like a series of lines.

17 The Visible Light Spectrum is a very small part of a much larger spectrum called the Electromagnetic Spectrum

18 How Do You Remember the Colours? All the colours spell the name Roy G Biv (but thats boring!)

19 Radio Waves MicrowavesInfra Red Visible Spectrum Ultra Violet X-RaysGamma Rays Raul'sMotherIsVisitingUncleXavier'sGarden RabbitsMateInVeryUnusualeXpensiveGardens RagingMartiansInvadeRoy G. Biv.UsingX-rays& Gamma Rays Words to remember the Electromagnetic Spectrum from Long to Short Wavelength

20 Las Vegas Light Show

21 What is BLACK Light? A lamp that emits electromagnetic radiation almost exclusively in the soft near ultraviolet range. Only a very small fraction of visible radiation is emitted, and it is seen as violet/blue light!

22 Playing with Light! Ray box 2 prisms Draw what you see under the light rays!

23 Vocabulary! Medium, Convection, Conduction Radiation Electromagnetic Wave Electromagnetic Spectrum Visible Light Prism

24 Homework! Pg. 469 # 2 - 9

25 Newton noted that the individual coloured lines could not be separated further. These lines are pure colours and are identified by a frequency and wavelength number.


Download ppt "What is Light?. What Is Light? Energy! Energy…. Usually needs a medium for transmission. Ex. Heat transfers by convection or conduction."

Similar presentations


Ads by Google