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Light
Sources
Incandescent Light
Incandescent light: when an object is heated to such a high
temperature that it emits visible light.
Example: candle flames and light bulbs
Note: 95 percent of the energy given off by incandescent light bulbs
is released as heat. That's why light bulbs are hot! In a way, an
incandescent source of light is like having a small electric heater in
the room.
Fluorescent Light
Fluorescent Light: Invisible ultraviolet light is
absorbed by the particles. These particles then
glow and emit light we can see (visible light).
In a fluorescent light tube an electric current from
the wires causes the mercury vapour inside the
tube to give off ultraviolet radiation. A phosphor
coating on the inside of the tube absorbs the
ultraviolet energy. This causes the coating to
glow, thus producing light that you can see.
Example: ‘Black light’, fluorescent light tubes
Fluorescent Light
Advantages:
• Don’t get as hot as incandescent lights
• They lose less energy and are energy efficient
Disadvantages:
• More expensive
• Harder to dispose of
• Chemicals inside can be toxic
Phosphorescent Light
Phosphorescent Light: similar to a
fluorescent source. Light energy is
absorbed by certain particles that can
store this energy for a while. The stored
energy is later released as visible light.
Example: Anything that has that green
glow in the dark color to it. Glow in the
dark star stickers you can put on your
ceiling.
Fluorescent vs. Phosphorescent Light
• Particles in the fluorescent source release their light energy
immediately. Phosphorescent particles take longer to emit light.
• Phosphorescent light also continues to glow for a while after the
energy source has been removed
Chemiluminescent Light
Chemiluminescent Light: When a
chemical reaction produces
energetic particles that give off
visible light energy.
Example: Glow sticks (The
chemicals inside the tube when you
crack it react and glow)
Bioluminescent Light
Bioluminescent Light: Chemical
reactions that happen inside living
creates to create a glowing
chemical
Example: Creatures at the bottom
of the ocean (The angular fish that
attacks dory in finding nemo)

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Light sources

  • 2.
  • 3. Incandescent Light Incandescent light: when an object is heated to such a high temperature that it emits visible light. Example: candle flames and light bulbs Note: 95 percent of the energy given off by incandescent light bulbs is released as heat. That's why light bulbs are hot! In a way, an incandescent source of light is like having a small electric heater in the room.
  • 4. Fluorescent Light Fluorescent Light: Invisible ultraviolet light is absorbed by the particles. These particles then glow and emit light we can see (visible light). In a fluorescent light tube an electric current from the wires causes the mercury vapour inside the tube to give off ultraviolet radiation. A phosphor coating on the inside of the tube absorbs the ultraviolet energy. This causes the coating to glow, thus producing light that you can see. Example: ‘Black light’, fluorescent light tubes
  • 5. Fluorescent Light Advantages: • Don’t get as hot as incandescent lights • They lose less energy and are energy efficient Disadvantages: • More expensive • Harder to dispose of • Chemicals inside can be toxic
  • 6. Phosphorescent Light Phosphorescent Light: similar to a fluorescent source. Light energy is absorbed by certain particles that can store this energy for a while. The stored energy is later released as visible light. Example: Anything that has that green glow in the dark color to it. Glow in the dark star stickers you can put on your ceiling.
  • 7. Fluorescent vs. Phosphorescent Light • Particles in the fluorescent source release their light energy immediately. Phosphorescent particles take longer to emit light. • Phosphorescent light also continues to glow for a while after the energy source has been removed
  • 8. Chemiluminescent Light Chemiluminescent Light: When a chemical reaction produces energetic particles that give off visible light energy. Example: Glow sticks (The chemicals inside the tube when you crack it react and glow)
  • 9. Bioluminescent Light Bioluminescent Light: Chemical reactions that happen inside living creates to create a glowing chemical Example: Creatures at the bottom of the ocean (The angular fish that attacks dory in finding nemo)