Let There Be Light!
Absorbing and Reflecting
Energy
Energy Conversion
Vision
What Else?
100
Light travels in a ________ ____.
straight line
100
to bounce off an object and change direction
reflect
100
the ability to do work
energy
100
What is the Law of Conservation?
Energy cannot be created or destroyed. It can only be converted from one form to another.
100
Light we can see
visible light
100
The passage of light through an object
transmission
200
Explain how a person can see a flower.
The light reflects off the flower into the person's eye.
200
to suck up / to take in and not allow to escape
absorb
200
Why type of energy is light?
radiant energy
200
Explain what happened in the balloon experiment that allowed the light bulb to light up.
Balloon picked up elec. charges in hair. ME moved balloon across light bulb. Elec charges moved & created EE. EE conv. to light (RE) in light bulb.
200
Invisible light used in remotes
Infrared light
200
The word that describes an object that light can pass through
transparent
300
Why can't you see anything in a room that is completely dark?
There's no light to reflect off of objects into our eyes.
300
When you shine white light on a red object, what happens to all of the other colors?
The object absorbs them.
300
What type of energy is heat?
thermal energy
300
What happened when you move the balloon across the light bulb slower or faster? Why?
Slower = dimmer / Faster = brighter / More movement of elec charges converted more radiant energy.
300
Invisible light that causes sunburns
ultraviolet light
400
What is white light?
All of the colors combined
400
A white object reflects ____ of the light that hits it.
most
400
What type of energy is food?
chemical energy
400
What experiment allowed our flashlight to work with only one battery?
Putting aluminum foil in the flashlight
400
Label the parts of the eye.
500
What is Mr. White Light's real name?
ROY G. BIV
500
a beam of light is split into many beams that go off in different directions
scatter
500
What type of energy is moving and playing?
mechanical energy
500
How did the flashlight operate with one battery compared to two?
1 Battery = Dimmer / 2 Batteries = Brighter
500
Where does your eye's lens focus the light that passes through it?
retina
600
What does the acronym ROY G BIV stand for?
red, orange, yellow, green, blue, indigo, violet
600
Why can you set a fire to a newspaper using a magnifying glass?
The magnifying glass concentrates the radiant energy into a small circle. This converts to thermal energy in the newspaper.
600
The movement of electrical charges for the purpose of converting to another form of energy
electrical energy
600
What form of energy does a battery store?
chemical energy
600
What do rods and cones do in the eye?
1. Detect light / 2. Converts radiant energy into electrical energy
700
Experiment that allows you to divide the colors in white light
Hold a CD up to the light
700
Draw light that is being reflected off a mirror, black paper, and white paper.
Mirror: Most reflected straight back / B. Paper: absorbs most / W. Paper: Scattered
700
Why does an object get hot when absorbing light?
because the light's radiant energy is converted into thermal energy
700
Why does a battery go dead after it has been used a while?
The chemical energy is used up as it is converted to other types of energy.
700
What is a blind spot?
The spot on the retina that connects to the optic nerve that has no rods and cones that can detect light.
800
If I held a CD up to a red Christmas light, what color(s) would you see in the CD? Why?
Red, because red light only gives off one color.
800
Why does wearing black make you hotter than wearing any other color on a hot summer day?
Because black absorbs all colors of light.
800
You are planning on going to the park. Why would it be a bad idea to skip breakfast?
Breakfast = Chemical Energy / Chemical energy gives us mechanical energy. / Mechanical energy = play
800
Name all of the energy conversions that happen while playing with a battery operated car.
Batteries = Chemical Energy --> Electrical Energy --> Mechanical Energy (movement)
800
What kind of light is absorbed into the water in food and then converted into heat which cooks the food?
microwaves