What is light reaction?where does ir occurs in plants?name the complete process.
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Light is a form of electromagnetic radiation, a
type of energy that travels in waves. Other
kinds of electromagnetic radiation that we
encounter in our daily lives include radio waves,
microwaves, and X-rays. Together, all the types
of electromagnetic radiation make up the
electromagnetic spectrum .
Every electromagnetic wave has a particular
wavelength , or distance from one crest to the
next, and different types of radiation have
different characteristic ranges of wavelengths
(as shown in the diagram below). Types of
radiation with long wavelengths, such as radio
waves, carry less energy than types of radiation
with short wavelengths, such as X-rays.
Image modified from " Electromagnetic
spectrum ," by Inductiveload ( CC BY-SA 3.0 ), and
" EM spectrum ," by Philip Ronan ( CC BY-SA 3.0 ).
The modified image is licensed under a CC BY-
SA 3.0 license
The visible spectrum is the only part of the
electromagnetic spectrum that can be seen by
the human eye. It includes electromagnetic
radiation whose wavelength is between about
400 nm and 700 nm. Visible light from the sun
appears white, but it’s actually made up of
multiple wavelengths (colors) of light. You can
see these different colors when white light
passes through a prism: because the different
wavelengths of light are bent at different angles
as they pass through the prism, they spread out
and form what we see as a rainbow. Red light
has the longest wavelength and the least
energy, while violet light has the shortest
wavelength and the most energy.
Although light and other forms of
electromagnetic radiation act as waves under
many conditions, they can behave as particles
under others. Each particle of electromagnetic
radiation, called a photon, has certain amount of
energy. Types of radiation with short
wavelengths have high-energy photons, whereas
types of radiation with long wavelengths have
low-energy photons.
Pigments absorb light used in
photosynthesis
In photosynthesis, the sun’s energy is converted
to chemical energy by photosynthetic
organisms. However, the various wavelengths in
sunlight are not all used equally in
photosynthesis. Instead, photosynthetic
organisms contain light-absorbing molecules
called pigments that absorb only specific
wavelengths of visible light, while reflecting
others.
The set of wavelengths absorbed by a pigment
is its absorption spectrum . In the diagram
below, you can see the absorption spectra of
three key pigments in photosynthesis:
chlorophyll a , chlorophyll b, and β-carotene. The
set of wavelengths that a pigment doesn't
absorb are reflected, and the reflected light is
what we see as color. For instance, plants
appear green to us because they contain many
chlorophyll a and b molecules, which reflect
green light.
type of energy that travels in waves. Other
kinds of electromagnetic radiation that we
encounter in our daily lives include radio waves,
microwaves, and X-rays. Together, all the types
of electromagnetic radiation make up the
electromagnetic spectrum .
Every electromagnetic wave has a particular
wavelength , or distance from one crest to the
next, and different types of radiation have
different characteristic ranges of wavelengths
(as shown in the diagram below). Types of
radiation with long wavelengths, such as radio
waves, carry less energy than types of radiation
with short wavelengths, such as X-rays.
Image modified from " Electromagnetic
spectrum ," by Inductiveload ( CC BY-SA 3.0 ), and
" EM spectrum ," by Philip Ronan ( CC BY-SA 3.0 ).
The modified image is licensed under a CC BY-
SA 3.0 license
The visible spectrum is the only part of the
electromagnetic spectrum that can be seen by
the human eye. It includes electromagnetic
radiation whose wavelength is between about
400 nm and 700 nm. Visible light from the sun
appears white, but it’s actually made up of
multiple wavelengths (colors) of light. You can
see these different colors when white light
passes through a prism: because the different
wavelengths of light are bent at different angles
as they pass through the prism, they spread out
and form what we see as a rainbow. Red light
has the longest wavelength and the least
energy, while violet light has the shortest
wavelength and the most energy.
Although light and other forms of
electromagnetic radiation act as waves under
many conditions, they can behave as particles
under others. Each particle of electromagnetic
radiation, called a photon, has certain amount of
energy. Types of radiation with short
wavelengths have high-energy photons, whereas
types of radiation with long wavelengths have
low-energy photons.
Pigments absorb light used in
photosynthesis
In photosynthesis, the sun’s energy is converted
to chemical energy by photosynthetic
organisms. However, the various wavelengths in
sunlight are not all used equally in
photosynthesis. Instead, photosynthetic
organisms contain light-absorbing molecules
called pigments that absorb only specific
wavelengths of visible light, while reflecting
others.
The set of wavelengths absorbed by a pigment
is its absorption spectrum . In the diagram
below, you can see the absorption spectra of
three key pigments in photosynthesis:
chlorophyll a , chlorophyll b, and β-carotene. The
set of wavelengths that a pigment doesn't
absorb are reflected, and the reflected light is
what we see as color. For instance, plants
appear green to us because they contain many
chlorophyll a and b molecules, which reflect
green light.
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