Artificial vs. Natural
What is a natural light source that you see daily, and gives off ultra-violet radiation?
The sun
What type of light source is created from a chemical reaction when different substances are mixed?
chemiluminescence
The angler fish contains glowing bacteria in its sac above its head. What type of light source is this?
bioluminescence
Give an example of incandescence.
Fire, light bulb, the sun
Red, orange, yellow, green, blue, violet are the colours of the _____?
Visible Light Spectrum
What is an artificial light source that is used in lamps and gets hot?
incandescent lightbulb
What type of light occurs when thermal (heat) energy is given off?
incandescent light
Glow in the dark stickers give off light. What type of light source are they?
phophorescence
Give an example of phosphorescence.
stickers, glow in the dark toys, watches, road paint, signs
What are light particles called?
photons
What type of light source is it when electricity passes through a gas and a glow is created?
electric discharge
A neon sign is what type of light source?
electric discharge
Give an example of electric discharge.
neon signs, lightening, northern lights, plasma ball
What is light?
Light is a form of electromagnetic energy.
Is the glow from a campfire a natural or artificial light source?
artificial - the fire was created by humans, not by a natural cause such as lightening and wind.
When an object stores energy from a light source and then slowly releases it as a glow over time, it is called: _______________.
Phosphorescence.
Crime scene investigators use a chemical called luminol to search for blood. When luminol mixes with hydrogen peroxide, it reacts with blood and causes it to glow. What kind of light source is this?
chemiluminescence
Give an example of fluorescence.
fluorescent bulbs, UV glow objects, highlighter fluid
Light travels in ________________.
waves
What is a natural light source made by living organisms such as deep-sea shrimp and bacteria called?
Bioluminescence
When you shine a UV black flashlight on an object, it takes some of the invisible UV light energy and converts it into visible light that we can see. What is this glowing effect called?
Fluorescence.
Give an example of bioluminescence.
fireflies, bacteria, fungi, deep sea shrimp, angler fish, etc.
Name the types of invisible light waves.
Radio, microwaves, gamma rays, x-rays, UV rays, infrared.