Light and the Electromagnetic Spectrum - Overview of light - Properties of light - Luminous and non-luminous objects - The strangeness of light - The electromagnetic spectrum - Wavelength of frequency - Colour & Colour Blindness - The production of light - The speed of light
Where does light come from? The SUN!! The sun is a star located 1.50 x 108 km, or 1 Astronomical Unit, away from Earth. It provides energy in the form of light through a process called nuclear fusion. Nuclear fusion occurs when two atoms that naturally repelled each other ___________ _____________
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Properties of Light _________ Laser
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_________ For example: Thunder and lightning start at the same time, but we will see the lightning first.
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Luminous and non-luminous objects _________ A non-luminous object is one that reflects light.
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Fun Science Light Video – Click the image in slideshow mode to see how videos are embedded into your lesson.
The Strangeness of Light Nothing moves faster than the speed of light 3.0 x 108 m/s Anything with mass cannot travel at the speed of light __________ Unlike heat and sound energy which requires a medium (a physical substance) to move, light does not Light is transferred through radiation (via electromagnetic waves) in a vacuum
Modern electromagnetic waves Today we have identified many types of electromagnetic waves which makes up our ________ Video link has been removed
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The Electromagnetic Spectrum Machines can detect other parts of the EM spectrum, but the information needs to be converted into colours for us to see it.
Example – The Sun visible x-ray UVA UVB
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Modern View Continued _________ Longer Wavelength Shorter Wavelength (Low Energy) Shorter Wavelength (High Energy) _________
Wavelength and Frequency Wavelength – the distance between successive crests on a wave. Frequency – …………..
The Visible Light Spectrum Different colours have different wavelengths!
Colour White light is not a single colour; it is made up of a mixture of the seven colours of the rainbow. We can demonstrate this by splitting white light with a prism: This is ………….
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Adding colours White light can be split up to make separate colours. These colours can be added together again. The primary colours of light are _________ Adding blue and red makes magenta (purple) Adding blue and green makes cyan (light blue) Adding red and green makes yellow Adding all three makes white again
Only red light is reflected Seeing colour The colour an object appears _________ For example, a red book _________ Homework White light Only red light is reflected
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Colour Blindness The tricky thing about colour blindness is that many people don’t know they are colour blind until they get tested 40% of colour blind pupils currently leaving secondary school are unaware that they are colour blind
How many animals are there?
Red Green Colour Blindness is caused by a gene on the X chromosome therefore, since males have 1 X and 1 Y …………. For these people, they cannot see red and green light.
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The Production of Light Light is produced by three main ways: Incandescence _________
The Production of Light Luminescence ____________
The Production of Light Chemoluminescence Chemical reactions _________
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How long will it take? Earth Moon 384,000,000 m How long does light take to reach the Earth from the Sun? _________
Looking Into The Past By looking at objects in the universe (stars and galaxies), you are looking into the past. Why?