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Exploring the Electromagnetic Spectrum and Light's Characteristics

Dive into the components of the electromagnetic spectrum, calculate frequencies, understand light's finite speed, and explore colors of light. Discover more than just visible light and the significance of electromagnetic waves in various fields.

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Exploring the Electromagnetic Spectrum and Light's Characteristics

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  1. Chapter 13 Section 1 Characteristics of Light

  2. Objectives • Identify the components of the electromagnetic spectrum. • Calculate the frequency or wavelength of electromagnetic radiation. • Recognize that light has a finite speed. • Describe how the brightness of a light source is affected by distance.

  3. Characteristics of light What do you think when you think of light? Well when most people think of light , they think of the light they can see What would be some example? Some examples include the bright, white light that is produce by a light bulb or the sun. However there is more to light When you hold a green plastic in front of a source of white light you see green light pass through

  4. Light • What you eyes recognize as white light is actually light that can separated into six elementary colors of the spectrum: • Spectrum can mean the visible spectrum, the range of wavelengths of electromagnetic radiation which our eyes are sensitive to …Spectrum colors are: red,orange,,yellow,green,blue and violet

  5. Light • The realization that visible light is made up of colors is most often attributed to Isaac Newton (though a strong case can be made that it was known well before him), who used a prism to create a spectrum (rainbow of colors) from a beam of white light, and another to recombine them back into white light. And what’s it called when you spread light into a spectrum, for the purpose of studying it (in astronomy, chemistry, …)

  6. Electromagnetic waves • An electromagnetic wave is a wave that consists of oscillating electric and magnetic fields, which radiate outward from the source at the speed of light. • Light is a form of electromagnetic radiation. • The electromagnetic spectrum includes more than visible light.

  7. Light • Not all light is visible to the human eye. If you were to use certain types of photographic film to examine the light disperse through a prism, you would find that the film records to have a much wider spectrum that the one you see.

  8. Electromagnetic waves

  9. Electromagnetic waves • Electromagnetic waves vary depending on frequency and wavelength. • All electromagnetic waves move at the speed of light. The speed of light, c, equals c = 3.00  108 m/s • Wave Speed Equation c = f speed of light = frequency  wavelen

  10. Example • The AM radio band extends from 5.4 x10^5hz to 1.7x10^6 . What are the longest and shortest wavelengths in this frequency range?

  11. Student guided practice • Do worksheet

  12. Waves • Waves can be approximated as rays. This approach to analyzing waves is called Huygens’ principle. • Lines drawn tangent to the crest (or trough) of a wave are called wave fronts. • In the ray approximation, lines, called rays, are drawn perpendicular to the wave front.

  13. Videos • Let’s watch some videos

  14. Homework • Do problems 1-6 iny our book page 445

  15. closure • Today we learned about light • Next we are going to go over flat mirrors

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