Visible light

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1. VISIBLE LIGHT PREPARED BY: EMMANUEL P. CANETE G11-STEM B

2. Electromagnetic waves a form of energy waves that have both an electric and magnetic field they can also travel in a vacuum

3. Examples of Electromagnetic Waves include radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma rays. Radio waves have the lowest energy and frequency and the longest wavelength.

4. What is Light ? Light is a transverse, electromagnetic wave that can be seen by the typical human. In physics, a transverse wave is a moving wave whose oscillations are perpendicular to the direction of the wave. the speed of light = 299 792 458 m / s

5. Visible Light Spectrum the section of the electromagnetic radiation spectrum that is visible to the human eye. Essentially, that equates to the colors the human eye can see. It ranges in wavelength from approximately 400 nanometers (4 x 10 -7 m, which is violet) to 700 nm (7 x 10-7 m, which is red). It is also known as the optical spectrum of light or the spectrum of white light

6. The wavelength of light , which is related to frequency and energy , determines the perceived color in the environment. Colors near the red color has lower frequency but higher wavelength. Colors near the violet color has higher frequency but lower wavelengths.

7. Types of Light Sources There are countless sources of light but they can all be categorized under either of the two following categories: Natural sources Artificial sources

8. Natural Sources The universe is filled with objects that emit light. Some of the light from these sources reach the earth. The following things in nature have the ability to emit light: SUN the major source of light for the earth. The sun is a massive ball of fire, at the center of which nuclear fusion produces massive energy. It is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma, with internal convective motion that generates a magnetic field via a dynamic process. It is by far the most important source of energy for life on Earth.

9. Natural Sources MOON provides light as well but it cannot produce light on its own. The light that we get from the moon is the light reflected by it from the sun.

10. Natural Sources BIOLUMINESCENCE some living organisms have the ability to produce light too. It is called bioluminescence . It is the effect of certain chemical reactions within the organism. Fireflies, jellyfish, glow worm, certain deep sea plants and microorganisms can be cited as examples.

11. Artificial Sources There are several different types of artificial light sources, some of these sources are: INCANDESCENT BULBS incandescent lamp or incandescent light globe is an electric light with a wire filament heated to such a high temperature that it glows with visible light.

12. Artificial Sources HALOGEN LAMPS also known as a tungsten halogen, quartz-halogen or quartz iodine lamp, is an incandescent lamp consisting of a tungsten filament sealed into a compact transparent envelope that is filled with a mixture of an inert gas and a small amount of a halogen such as iodine or bromine.

13. Artificial Sources COMPACT FLUORESCENT LAMP also called compact fluorescent light, energy-saving light, and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent light bulb; some types fit into light fixtures designed for incandescent bulbs.

14. Artificial Sources LIGHT-EMITTING DIODE (LED) a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons.

15. CONCLUSION Light is one of the most important aspects of human life guiding us both literally and figuratively we should continue on studying to further improve technologies that will make our overall life and future even better.

16. END OF PRESENTATION PREPARED BY: EMMANUEL P. CANETE G11-STEM B