1. Light!

2. Before we begin…
Our class time in here will be similar to when we had the animals: we will need to direct our attention to the SmartBoard first, then break off into stations and activities.
There will be no science journals!
If you choose not to cooperate you will be answering questions from books at the front or worksheets with the science textbook.

3. What questions do we have about light and electricity?
Write a question on a slip of paper and put it in our question box.
We will draw 2 questions each day to answer.

4. What is light? Light is a form of ENERGY.
- Energy is the ability to make something move, happen or change.

5. The colors of the visible light spectrum
What is light?
Light is made up of many different COLORS.
- The different colors appear when white light is passed through a prism separated into a spectrum.
- The colors represent different amounts of energy.
The colors of the visible light spectrum
color
wavelength interval
frequency interval
red
~ 700–635 nm
~ 430–480 THz
orange
~ 635–590 nm
~ 480–510 THz
yellow
~ 590–560 nm
~ 510–540 THz
green
~ 560–490 nm
~ 540–610 THz
blue
~ 490–450 nm
~ 610–670 THz
violet
~ 450–400 nm
~ 670–750 THz

6. Types of light
Visible light is the light that humans can see. Other animals can see different types of light. Dogs can see only shades of gray and some insects can see light from the ultraviolet part of the spectrum. The key thing to remember is that our light is what scientists call visible light.
In order for an object to be visible, it must either:
1. Give off its own light ( sun, candle, flashlight) OR
2. REFLECT light

7. Seeing light
The visible light you see is the light that is NOT absorbed by objects. Green plants for example, are green because they absorb all of the colors of the visible spectrum EXCEPT the green color.

8. Review
Study Jams Clip

9. Separate sunlight into the colors of the spectrum!
Today we will:
Separate sunlight into the colors of the spectrum!
You need: Pencil
Jacket
Prism
“Prism Play” Sheet

10. How Light Travels through objects

11. A transparent material allows light to pass through it because it is not absorbed or reflected.
Objects can be seen clearly when viewed through transparent materials.
Air, glass, and water are examples of
materials that are transparent.

12. examples Light passes through air clearly.
Water allows light to pass through easily.
Light bulbs are made of
glass

13. A translucent material scatters or absorbs some of the light that strikes it and allows some of the light to pass through it.
Objects appear as blurry shapes when viewed through translucent materials.
Waxed paper and frosted glass are
examples of materials that are translucent.

14. Wax paper does not let light pass through easily.
Frosted glass does not let light pass through easily.

15. An opaque material does not allow light to pass through, light is either reflected from or absorbed by an opaque material.
Wood, metals, and thick paper are examples
of materials that are opaque.

16. Light cannot pass through wood like a baseball bat.
Light cannot pass through a football.
Light cannot pass through Cocky.

17. Light’s Primary Colors
The human eye recognizes color using photo receptors called cones, which are located in the retina of each eye.
There are 3 types of cones that are each sensitive to 1 of the 3 primary colors of light – red, blue, green.

18. Light’s Primary Colors
Red
Blue
Green
(NOT Yellow)

19. Today we will… Rotate at two different stations:
One will be using the primary colors of light with flashlights and the “Colortime Theatre” worksheet.
The other will be identifying opaque, translucent, and opaque materials using a flashlight as a source of light and recording your findings.

20. Combining the primary colors of light produces…
Cyan
Yellow
Magenta

21. How Light strikes objects

22. How light strikes objects
When light hits an object, the light will either:
bounce off (reflection),
change direction (refraction), or
not reflect or pass through (absorbed).

23. Reflection When light is reflected, it bounces back from a surface.
Reflection allows objects to be seen that do not produce their own light.

24. Reflection
When light strikes a smooth, shiny object, a mirror, or a pool of water, it is reflected so that a reflection can be seen that looks very similar to the object seen with light reflected directly from it.

25. Refraction
When light is refracted it passes from one type of transparent material to another, and changes direction. For example, when light travels through a magnifying glass, it changes direction, and we see a larger, magnified view of the object.

26. Refraction
When a pencil is viewed in water, light passes from the water to the air causing the path of the light to bend. When the light bends, the pencil appears distorted (bent or broken)

27. Absorption
When light is absorbed it does not pass through or reflect from a material. It remains in the material as another form of energy.
The colors of objects are determined by the light that is not absorbed but is reflected by the objects.
All other colors of light striking the object are absorbed by the object.
A red object, for example, reflects red colors of light and absorbs all other colors.

28. http://studyjams. scholastic

29. Reflection Station

30. Reflection Station

31. Absorption Station

32. Refraction Station