Types of Light (Physics Gr10)

Incandescent light is produced by

• heating

• chemical reaction

• the moon

• all light bulbs

fluorescence is produced when

• the material is heated

• ultraviolet light is absorbed by the material, then emitted

• gamma rays are absorbed by the material, then emitted

• the material absorbs phosphors

phosphorescence is produced when

• the material is heated

• gamma rays are absorbed by the material, then emitted

• ultraviolet light is absorbed by phosphors coating the material, then emitted

• ultraviolet light is absorbed by the material, then emitted

what are the differences between phosphorescence and fluorescence? (select all that apply)

• in phosphorescence, the absorbed light can take a long time for all of it to be emitted

• in fluorescence, the absorbed light is immediately emitted

• in fluorescence, the material is coated in phosphors

• in phosphorescence, the material is coated in phosphors

Bioluminescence is observed when

• certain living organisms produce light

• the material is heated

• ultraviolet light is absorbed by the material, then emitted

• gamma rays are absorbed by the material, then emitted

Chemiluminescence occurs due to

• heating

• a chemical reaction

• absorption and emission of ultraviolet light

• passage of an electric current

what is electric discharge?

• electricity produced by large amounts of light

• light produced by heating

• an electrochemical reaction that produces a gas

• light produced when electricity is passed through a gas

what is triboluminescence?

• the emission of light resulting from chemical reactions in crystals

• the emission of light resulting from exposure to heat

• the emission of light resulting from mechanical action on certain crystals

• the emission of light resulting from exposure to sound waves

LED is...

• Laser Emitting Diode
• light produced by the sun

• very cheap

• light produced when electricity is passed through a diode

which of the following is luminous?

• Eyes

• Water

• Moon
• Star