Light bulbs
What are three natural sources of incandescent light?
Sun, fire and lightning.
Explain how an incandescent light bulb gives off light.
An incandescent light bulbs use an electric current going through a tungsten filament.
How is a halogen light bulb different from an incandescent light bulb?
Halogen light bulbs are different because they are hotter than incandescent light bulbs. They also use gas. The tungsten can also can be recycled.
Which form of light bulb lasts the longest: Fluorescent, LED, or halogen?
LED
What are two examples of light bulbs that are luminescent, not incandescent?
LED and CFL because they don't give off any heat.
What is the difference between the way light is produced through luminescence and the way light is produced through incandescence?
Luminescence light is the production of light without high temperature and incandescence is the production of light by high temperature, light is given off as a glow or a burst of flames.
Fluorescence light bulbs
No heat, No filament. An electric current passes through Mercury vapor inside the tube, this makes UV light. The white phosphor coating absorbs the UV light and emits Visible Light.
How is a bioluminescent fish different from a "regular" fish?
The fish glows.
Why are incandescent light bulbs considered to be a "waste of energy"?
They are a waste of energy because they produce more heat than light.
How are animals dependent on plants? (two reasons at least)
They are depending on plants for food and for some vitamins.
How are plants dependent on sunlight?
They depend on sunlight because sunlight is their food.
Why do fluorescent light bulbs and CFL's have to be recycled?
They have to be recycled because the mercury is dangerous.