 Students will be able to define electromagnetic radiation.  Students will be able to explain how telescopes work.  Students will be able to describe

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    03-Jan-2016

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<ul><li><p>Students will be able to define electromagnetic radiation.Students will be able to explain how telescopes work.Students will be able to describe how space exploration helps scientists learn about the universe.</p></li><li><p>Refraction: Occurs when a light ray changes direction as it passes from one material into another.</p></li><li><p>Page 764Main Idea: Radiation emitted or reflected by distant objects allows scientists to study the universe.</p></li><li><p>Page 764Electromagnetic Radiation: Electric and magnetic disturbances traveling through space as waves.</p><p>Electromagnetic Spectrum: Electromagnetic radiation arranged according to wavelength and frequency.</p></li><li><p>Electromagnetic SpectrumHigh Energy = HotLow Energy = Cool</p></li><li><p>Page 764Wavelength and Frequency: Wavelength: Distance between peaks on a wave.Frequency: Number of waves that pass a given point pre second. Measured in Hertz (Hz) = 1 cycle per second.</p></li><li><p>Page 765Telescopes: Objects in space emit electromagnetic radiation.Telescopes collect electromagnetic radiation and turn it into an image.Aperture: A telescopes opening. Can be up to 10 m in diameter.Larger aperture = More electromagnetic radiation.</p></li><li><p>Page 766Refracting and Reflecting Telescopes: Refracting Telescope: Uses lenses to bring visible light into a focus.Invented in 1600s.Reflecting Telescopes: Invented in 1668. Uses mirrors to bring visible light into focus.</p><p>Best locations for telescopes are away from city lights and at high elevations where there is less atmosphere to interfere with images.</p></li><li><p>Page 766Telescopes Using Non-Visible Wavelengths: Some electromagnetic radiation cannot be seen.i.e. X-Rays and Gamma RaysTelescopes can only detect the direction from which this type of radiation comes.</p></li><li><p>Page 766Radiotelescope: Uses a dish to collect radio and longer wave length electromagnetic radiation. </p><p>Interferometry: Technique that combines several images to create 1 image.Brings out more details.</p></li></ul>

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