Free rate of photosynthesis Essays and Papers - …

Oct 5, 2012. of green light is in photosynthesis. The electromagnetic spectrum Light. Visible light ranges from low blue to far-red light and is described as. However, visible light is just a small portion of the electromagnetic spectrum. Energy is inversely porportional to the wavelength – longer wavelengths have less. The visible spectrum is the only part of the electromagnetic spectrum that can be seen by the human eye. It includes electromagnetic radiation whose.

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Wavelength (nm)

Colour of light

400

Violet

Indigo

Blue

500

Green

Yellow

600

Orange

Red

700

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In photosynthetic plants the pigments are very important.


IB Biology Notes - 8.2 Photosynthesis

The relative absorption of light of different wavelengths by pigments can be shown in absorption spectra.

For photosynthesis to occur, plants need: · Light energy from the sun · Chlorophyll to absorb light energy · Carbon dioxide from the atmosphere and from respiration in plant cells · Water which is absorbed by the roots and transported to the leaves by the xylem tubes....


Theoretical Concepts and Reaction Mechanisms - …

They absorb
light energy and enable it to be converted into chemical energy which
is used by the plants to make glucose and oxygen from carbon dioxide
and water.

absorptivity emissivity Solar Absorption & Emissivity

As we can see, there is a close relationship between the action spectrum and absorption spectrum of photosynthesis. There are many different types of photosynthetic pigments which will absorb light best at different wavelengths. However the most abundant photosynthetic pigment in plants is chlorophyll and therefore the rate of photosynthesis will be the greatest at wavelengths of light best absorbed by chlorophyll (400nm-525nm corresponding to violet-blue light). Very little light is absorbed by chlorophyll at wavelengths of light between 525nm and 625 (green-yellow light) so the rate of photosynthesis will be the least within this range. However, there are other pigments that are able to absorb green-yellow light such as carotene. Even though these are present in small amounts they allow a low rate of photosynthesis to occur at wavelengths of light that chlorophyll cannot absorb.

All materials have absorption and emissivity factors

Red algae, which
tend to be found at even greater depths, contain more pigments to
absorb the blue light which penetrates deeper into the water.

Peidong Yang | College of Chemistry

The greenhouse effect refers to circumstances where the short wavelengths of light from the sun pass through a medium and are absorbed, but the longer wavelengths of the re-radiation from the are unable to pass through that medium. The trapping of the long wavelength radiation leads to more heating and a higher resultant temperature. Besides the heating of an automobile by sunlight through the windshield and the namesake example of heating the greenhouse by sunlight passing through sealed, transparent windows, the greenhouse effect has been widely used to describe the trapping of excess heat by the rising concentration of in the atmosphere. The carbon dioxidestrongly absorbs infrared and does not allow as much of it to escape into space.