Chapter 7: Understanding Light Flashcards
Give two examples of natural light sources
Give two examples of artificial light sources
Fire, sun, fireflies, jellyfish
Lightbulbs, glow in the dark watches
What is radiant energy?
Light that spreads out or radiates from a natural sources
What is it called when light bends?
Refraction
What is the light that bounces of an object called?
the reflected ray
What is the normal?
The imaginary line perpendicular to a surface
Give an example of radiant energy
The energy given of from a light bulb
Transparent
Translucent
Opaque
See through
Mostly see through
Can’t see through
Incandescent sources produce a lot of_____
heat
95% of the energy given off from an incandescent source is thermal. Its like having a mini heater in your room
Luminous
Glowing, gives off it’s own light
What equals the angle of reflection?
The angle of incidence
Why should you wear white when its sunny?
Because black absorbs heat meanwhile white reflects it
Give three examples of forms of radiant energy
Thermal energy (heat) Chemical energy (food) Electrical (electricity)
What word can we use to describe the brightness of light?
Intensity
Where does the suns energy come from?
Nuclear Fusion
Energy transformation for incandescent source
Electrical energy -) Thermal energy -) Visible light energy