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SNC 2D Notes: Luminous Sources A. Where Does Light Energy Come From Light energy comes from other forms of energy. In luminous objects some forms of energy can be converted into light energy. The forms of energy that commonly converted into light energy are chemical energy, electrical energy, and thermal (heat) energy. Types of Sources of Light Light produced by the Sun or other stars are called natural light. Light produced through human technology is called artificial light. Natural Sources Of Light Artificial Source Of Light Sun Light Bulb Stars Match Lightning Lighter Fire Flashlight Volcanoes Laser Fireflies Explosion Northern Lights Fire Works Oil Lamp Computer Screen Sources of light 1. Objects that emit light are said to be 2. Sunlight is the most . source of light. Master Yoda Much Learning You Have Yes! 3. is when light is produced from a chemical reaction without a rise in temperature. An example of this is a glow stick. 4. Bioluminescence light is produced by . within the cells of organisms produces light. Some common examples are and . 5. Bioluminescence is a form of . 6. Incandescent light is light that is produced by an object that is extremely . Incandescent light bulbs are only _______ efficient in producing light. The remaining energy is lost as . 7. On the other hand, fluorescent light is produced when an object has absorbed invisible radiation. Fluorescent light sources sources are efficient and last longer than incandescent light sources. 8. Luminescence describes a light source that is able to generate light Master Yoda Much Learning You Have Yes! without heating the object. is a form of luminescence. Fluorescent light is light emitted by a substance when they are exposed to electromagnetic radiation. is also another form of luminescence. Phosphorescent materials get their source of energy from 9. Producing light from friction is called be made to glow by just light. . Some crystals can them together or crushing them. 10. An electric discharge is a method for producing light in which a passes through the air or another gas such as neon. 11. Similar to water, light travels like a wave. This wave is called an wave. 12. The speed of light is m/s. 13. The colour of light is determined by the different . Red has the wavelength while has the shortest. Master Yoda Much Learning You Have Yes! 14. __________________________ objects cannot produce their own light. They may appear bright by reflecting light from a luminous object. The is an example of a non-luminous light source. Master Yoda Much Learning You Have Yes!