11 Our ears can not hear some high sound frequencies that dogs can. Radiometer and hot ironE3.2 identify and label the visible and invisible regions of the electromagnetic spectrumSimilarly 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 spectrumSir Isaac Newton’s full name with title is easy to remember because of his initials (i.e. SIN)
14 Similarly….A rainbow appearsin the sky fromthe sun’s rays.
15 So….when light from the sun is broken down, its’ spectrum looks like Encourage students to make up their own mnemonic for remembering the order of rainbow colours.Let them know “A mnemonic is just a way to remember simple lists”To show students a very good full spectrum seeNote the Capital letters denote the Additive Primary colours. More on this later in “Seeing Colour.ppt”Isaac Newton named the colors of the spectrum we use today. At first he only identified 5 colours (red, yellow, green, blue, violet) He changed this to seven colors out of a mistaken belief, derived from the ancient Greeks. They believed there was a connection between the colors, the musical notes, the known objects in the solar system, and the days of the week. Newton therefore added Orange and Indigo to make up 7 names for the main colours of he spectrum i.e. ROYGBIV, Red, Orange, Yellow, Green, Blue, Indigo, VioletThe sun’s light is thereforeWhite Light.
16 When light from some sources is broken down, it’s Spectrum looks like a series of lines. Students will benefit by viewing various light sources including Spectrum Tubes through Spectroscopes. This will clearly demonstrate most light is really made up of a series of pure colours
17 The Visible Light Spectrum is a very small part of a much larger spectrum called the Electromagnetic SpectrumE3.2 identify and label the visible and invisible regions of the electromagnetic spectrum
18 How Do You Remember the Colours? All the colours spell the nameRoy G Biv(but that’s boring!)
19 Words to remember the Electromagnetic Spectrum from Long to Short Wavelength Radio WavesMicrowavesInfra RedVisible SpectrumUltra VioletX-RaysGamma RaysRaul'sMotherIsVisitingUncleXavier'sGardenRabbitsMateInVeryUnusualeXpensiveGardensRagingMartiansInvadeRoy G. Biv.UsingX-rays& Gamma RaysE3.2 identify and label the visible and invisible regions of the electromagnetic spectrum
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!