Although the proportion of various spectra of solar radiant energy reaching the ground varies depending on latitude, season, topography and meteorological conditions, it is basically stable. According to the wavelength of solar radiation, it is generally divided into ultraviolet light, visible light, infrared light and the like. The effects of different wavelengths of light on animals and plants are different.
“Pulse irradiation†also saved electricity, and preliminary estimates have reduced the production cost of vegetables by nearly 30%. However, the LED lighting used here is not a fluorescent lamp for general household use. The fluorescent light emitted by households is mainly blue light waves, which is not helpful for plant growth. The LED lamps used by Japanese experts mainly have red, blue and green primary light sources, so as to effectively promote plant growth.
1, ultraviolet light
This light has a wavelength between 170 and 400 nm. Ultraviolet light with a wavelength of less than 290 nm can cause the destruction of plants, so it is also called extinct radiation. Ultraviolet light with a wavelength between 290 and 400 nm is a necessary light for plants. It has a certain effect on the formation of phytochemicals. It can inhibit the elongation of crops and make crops shorter. It has a certain disinfection effect on the soil. Sun-breeding, and has the role of germination.
2, visible light
The wavelength of light is between 400 and 760 nm. The light in this band plays a decisive role in the living function of plants, mainly in the light effect. They are the main light for plants to synthesize and synthesize organic matter. Especially in the red-orange light with a wavelength of 600-700 nm, the photosynthesis of plants is the strongest, which is conducive to the formation of sugar, that is, the formation of yield; the yellow-green light with a wavelength of 500-600 nm has little absorption of leaves and the strongest reflection; Basket violet with a wavelength of 400-500 nm can prolong the flowering process of plants, promote the synthesis of proteins and fats, and have a strong influence on the chemical composition of plants. In the process of photosynthesis, green plants only assimilate the energy of light in the wavelength range of 44-760 nm. The solar radiation absorbed by photosynthesis of green plants is often referred to as physiological radiation, also known as light and effective radiation.
3, infrared light
The wavelength of light is between 760 and 4000 nm. The effect of light in this band on plants is mainly reflected in the thermal effect. It determines the temperature and transpiration of the organism and is generally not or rarely absorbed by plants. It has no practical effect on the physiological processes of plants, so the radiation of this band of light is also called abiotic radiation.
Light enters the vision through three forms:
Light source light: The color light emitted by the light source directly enters the vision. Lights such as neon lights, decorative lights, candle lights, etc. can directly enter the vision.
Transmitted light: The light that passes through a transparent or translucent object and then enters the visible light, called transmitted light. The brightness and color of the transmitted light depends on the light transmittance and wavelength characteristics achieved by the incident light passing through the transmitted object.
Reflected light: Reflected light is the most common form of light entering the eye. In the case of light, any object that the eye can see is caused by the reflected light of the object.
When observing the chloroplast pigment extract, the color of the extract in the test tube is observed to be A. against the light source (transmitted light) and the light source (reflected light). Green and green B. Light yellow and green C. Red and orange yellow D. Green and red Because the chloroplast pigment mainly absorbs red and blue-violet light, green light is hardly absorbed. Therefore, the light source (transmitted light) is green, and the light source (reflected light) is red.
“The acetone extract of chlorophyll is emerald green in transmitted light and brownish red in reflected light.†What is the reason?
When the chlorophyll extract was observed against the light source, the absorption spectrum of chlorophyll was observed. Since the chlorophyll extract absorbs the least part of the green light, it is observed by the naked eye as green transmitted light.
When the backlight was observed for the chlorophyll extract, the emission spectrum produced by the chlorophyll molecule was observed. When the chlorophyll molecule absorbs photons, it increases from the most stable, lowest energy ground state to an unstable, high-energy excited state. Since the excited state is unstable, the light wave is emitted (this light wave is fluorescent), the energy disappears, and the excited state returns to the ground state quickly. Part of the light energy absorbed by the chlorophyll molecule is used for internal vibration of the molecule, and the energy radiated is small. Light is discontinuously propagated in the form of photons, and E = hv = hc / λ, ie the wavelength is inversely proportional to the photon energy. Therefore, the wavelength of the reflected light wave is longer than the wavelength of the incident light wave, and the chlorophyll extract is red under the reflected light.
The chlorophyll solution is green under transmitted light and red under reflected light is called fluorescence.
Why is the transmitted and reflected light of the chloroplast different?
The pigment in the chloroplast can absorb red and blue-violet light in a large amount, and almost does not absorb green light. When the white light passes through the pigment extract, the red light and the blue-violet light in the white light are absorbed, and the remaining light is processed by the human eye. It will turn green (in fact, there are, orange light, yellow light, dawn, etc.).
The true reflected light is also dominated by green light, just like transmitted light. The dark red color we see is due to the fact that the pigment in the solution absorbs blue-violet light and cannot be used for photosynthesis (without the corresponding enzyme system), and the fluorescence is re-radiated. Because energy is lost during absorption—a part of the radiation is converted into heat, the fluorescence is less red than the blue-violet energy. Also, since the pigment is almost completely transparent to green light, there is a lot of green light transmitted, and little green light is reflected. Therefore, from the transmission direction, it is green light. We look green. From the direction of reflection, there is very little green light. The red fluorescence is dominant. We look red.
Chloroplast pigments are only fluorescent when they are extracted into solution. The pigment in the normal leaves is used for photosynthesis due to absorbed light, and there is no fluorescence.
The red light absorbed by the pigment also forms fluorescence, but the energy of the red light is low. After losing a part of it, the emitted fluorescence becomes infrared light that is invisible to the human eye.
“Pulse irradiation†also saved electricity, and preliminary estimates have reduced the production cost of vegetables by nearly 30%. However, the LED lighting used here is not a fluorescent lamp for general household use. The fluorescent light emitted by households is mainly blue light waves, which is not helpful for plant growth. The LED lamps used by Japanese experts mainly have red, blue and green primary light sources, so as to effectively promote plant growth.
1, ultraviolet light
This light has a wavelength between 170 and 400 nm. Ultraviolet light with a wavelength of less than 290 nm can cause the destruction of plants, so it is also called extinct radiation. Ultraviolet light with a wavelength between 290 and 400 nm is a necessary light for plants. It has a certain effect on the formation of phytochemicals. It can inhibit the elongation of crops and make crops shorter. It has a certain disinfection effect on the soil. Sun-breeding, and has the role of germination.
2, visible light
The wavelength of light is between 400 and 760 nm. The light in this band plays a decisive role in the living function of plants, mainly in the light effect. They are the main light for plants to synthesize and synthesize organic matter. Especially in the red-orange light with a wavelength of 600-700 nm, the photosynthesis of plants is the strongest, which is conducive to the formation of sugar, that is, the formation of yield; the yellow-green light with a wavelength of 500-600 nm has little absorption of leaves and the strongest reflection; Basket violet with a wavelength of 400-500 nm can prolong the flowering process of plants, promote the synthesis of proteins and fats, and have a strong influence on the chemical composition of plants. In the process of photosynthesis, green plants only assimilate the energy of light in the wavelength range of 44-760 nm. The solar radiation absorbed by photosynthesis of green plants is often referred to as physiological radiation, also known as light and effective radiation.
3, infrared light
The wavelength of light is between 760 and 4000 nm. The effect of light in this band on plants is mainly reflected in the thermal effect. It determines the temperature and transpiration of the organism and is generally not or rarely absorbed by plants. It has no practical effect on the physiological processes of plants, so the radiation of this band of light is also called abiotic radiation.
Light enters the vision through three forms:
Light source light: The color light emitted by the light source directly enters the vision. Lights such as neon lights, decorative lights, candle lights, etc. can directly enter the vision.
Transmitted light: The light that passes through a transparent or translucent object and then enters the visible light, called transmitted light. The brightness and color of the transmitted light depends on the light transmittance and wavelength characteristics achieved by the incident light passing through the transmitted object.
Reflected light: Reflected light is the most common form of light entering the eye. In the case of light, any object that the eye can see is caused by the reflected light of the object.
When observing the chloroplast pigment extract, the color of the extract in the test tube is observed to be A. against the light source (transmitted light) and the light source (reflected light). Green and green B. Light yellow and green C. Red and orange yellow D. Green and red Because the chloroplast pigment mainly absorbs red and blue-violet light, green light is hardly absorbed. Therefore, the light source (transmitted light) is green, and the light source (reflected light) is red.
“The acetone extract of chlorophyll is emerald green in transmitted light and brownish red in reflected light.†What is the reason?
When the chlorophyll extract was observed against the light source, the absorption spectrum of chlorophyll was observed. Since the chlorophyll extract absorbs the least part of the green light, it is observed by the naked eye as green transmitted light.
When the backlight was observed for the chlorophyll extract, the emission spectrum produced by the chlorophyll molecule was observed. When the chlorophyll molecule absorbs photons, it increases from the most stable, lowest energy ground state to an unstable, high-energy excited state. Since the excited state is unstable, the light wave is emitted (this light wave is fluorescent), the energy disappears, and the excited state returns to the ground state quickly. Part of the light energy absorbed by the chlorophyll molecule is used for internal vibration of the molecule, and the energy radiated is small. Light is discontinuously propagated in the form of photons, and E = hv = hc / λ, ie the wavelength is inversely proportional to the photon energy. Therefore, the wavelength of the reflected light wave is longer than the wavelength of the incident light wave, and the chlorophyll extract is red under the reflected light.
The chlorophyll solution is green under transmitted light and red under reflected light is called fluorescence.
Why is the transmitted and reflected light of the chloroplast different?
The pigment in the chloroplast can absorb red and blue-violet light in a large amount, and almost does not absorb green light. When the white light passes through the pigment extract, the red light and the blue-violet light in the white light are absorbed, and the remaining light is processed by the human eye. It will turn green (in fact, there are, orange light, yellow light, dawn, etc.).
The true reflected light is also dominated by green light, just like transmitted light. The dark red color we see is due to the fact that the pigment in the solution absorbs blue-violet light and cannot be used for photosynthesis (without the corresponding enzyme system), and the fluorescence is re-radiated. Because energy is lost during absorption—a part of the radiation is converted into heat, the fluorescence is less red than the blue-violet energy. Also, since the pigment is almost completely transparent to green light, there is a lot of green light transmitted, and little green light is reflected. Therefore, from the transmission direction, it is green light. We look green. From the direction of reflection, there is very little green light. The red fluorescence is dominant. We look red.
Chloroplast pigments are only fluorescent when they are extracted into solution. The pigment in the normal leaves is used for photosynthesis due to absorbed light, and there is no fluorescence.
The red light absorbed by the pigment also forms fluorescence, but the energy of the red light is low. After losing a part of it, the emitted fluorescence becomes infrared light that is invisible to the human eye.
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Grille Down Light
Grille Down Lights,Ceiling Downlights,Led Recessed Ceiling Downlights,Cri90 Ceiling Downlights
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