limbiks_APZNZA~3.PDF (2) Flashcards
Name two natural sources of light
Sun, and Star
Give an example of a luminous object.
Candle fire
What is the name given to an object that does NOT emit light?
NON-LUMINOUS
Source Name: Incandescent
Description: Emission of Visible light by hot object. Example: Light bulb
Source Name: Fluorescent
Description: UV Light, electric current>heats mercury vapour> UV radiation. Example: Fluorescent tube
Source Name: Phosphorescent
Description: absorbed by phosphor glow, emission of light after exposure. Example: Inner surface of TVs
Source Name: Chemiluminescent
Description: energy released no chemical reactions. Example: Glow sticks
Source Name: Bioluminescent
Description: Chemicals run in the bodies of organisms. Example: Jellyfish
What transformations of energy occur when Tracy throws a beachball at Connor’s head?
Sound Energy, Kinetic Energy, Heat Energy
What happens when a large number of rays strike an object?
More rays are absorbed or deflected
How does light travel?
In straight lines
What causes a shadow?
Refraction of light
What is the relationship between the angle of incidence and the size of the shadow?
Larger angle = smaller shadow
What type of light source creates a sharp shadow?
Small source
What results in a fuzzy shadow outline?
Large source
