You... Light up..... my life .

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