you... light up..... my life
TRANSCRIPT
You...
Light up.....
my life
https://www.youtube.com/watch?v=50B8ErvdElI
To understand the properties of light...1. It is a form of energy!...(I can prove it!)2. How it is produced3. How it travels4. How it interacts with objects
Light ...is a form of energy because it has the ability to do work
Ex: When light energy from the sun hits a black shirt it begin to heat the shirt because light energy is turned into thermal energy
Energy is neither created or destroyed...it simply changes forms
Review ******
Producers turn light energy into chemical energy which consumers eat and turn into sound energy...thermal energy and kinetic energy
Sun
Plants
herbivores carnivores omnivores
How is light made...ON THE MOVE...Let me explain!!!
Nucleus---center of atom
Neutrons---carry no charge and found in nucleus
Protons---carry a positive charge and found in nucleus
electrons---carry a negative charge and found in outside orbits
Electrons...jump orbits and when they do they release energy which we see as a burst of light...Photons
Are all objects visible?
Travels in straight line
And...its fast...186,000 miles per second
Sun light leaving our star reaches us in 8 minutes
ONLY.... if reflection or refraction occurs
Another REVIEW !!!!
To understand how light interacts with objects it encounters
Reflection.....
So.... why do I see colors?
Fact #1 we see white light when all the colors of the spectrum are reflected back into our eyes
You see colors ...when white light hits an object and all the colors are absorbed except for the color which you see---that color is reflected by the object and comes back to your eye. So red objects reflect red --- orange objects reflect orange --- green reflect green .... etc
white light
red
green
all other colors are absorbed
Fact # 2
Fact #3
white light
All the colors are absorbed and nothing is reflected back to the eye
Reflection involves a change in direction of waves when they bounce off a barrier. Refraction of waves involves a change in the direction of waves as they pass from one medium to another. Refraction, or the bending of the path of the waves, is accompanied by a change in speed and wavelength of the waves.
Reflection is when light bounces off an object. If the surface is smooth and shiny, like glass, water or polished metal, the light will reflect at the same angle as it hit the surface.
2
Refraction causes the rainbow effect