1. DO NOW!!  Why do we need light?
How does light affect our ability to live?
What would happen if the sun burned out?

2. Ch. 8: Cellular Energy!!
Light and Pigments

3. Objectives
To understand the different types of light and their wavelengths.
To be able to explain how pigments enable us to see different colors.
To determine the role of light and pigments in photosynthesis.

4. So what is light? Energy!!! Travels in waves
The distance between 2 crests is a wavelength.

5. Wavelengths There are different wavelengths for each type of light.
The shorter the wavelength, the higher the energy!!

6. Visible Light The light we see is called visible light. ROYGBIV…

7. Which color has… The shortest wavelength? The longest wavelength?
What is wavelength measured
in?

8. Why do we see COLORS? The color you see is the color being reflected.
*All other colors are being absorbed.
So why do black shirts get hot in the sun??

9. So ponder this… Why do plants appear to be green?
Why are Ms. Finn’s glasses blue? And the sky?

10. Pigments Chemical compound that gives a substance it’s color
They can absorb and reflect certain wavelengths
Pigments are everywhere (clothes, flowers, etc.)
Ex: Chlorophyll, Carotenoids.
Why do you think pigments are necessary for photosynthesis?

11. Chlorophyll Green pigment that aids in photosynthesis.
Found in leaves and appears green.
Allows plant to capture light.

12. Think- Pair- Share Use the absorption spectrum for chlorophyll…
What colors does chlorophyll absorb?
What colors does it reflect?
What color does it appear to us?

13. Carotenoids Orange pigment found in most leaves.
Absorbs additional light

14. Review! What type of light do we see? What is a pigment?
What are the names of the pigments in leaves?
Why are pigments important in photosynthesis?